50 Essential Tax Strategy Thought Leaders in the UK and Europe (2026)

Last updated: June 2026

Introduction

The tax decisions being made across the UK and Europe right now will shape how governments fund public services, how multinationals structure their global operations, and how wealth is taxed and transferred for the next generation. Those decisions are not being made in a vacuum. They are being shaped by a community of academics, practitioners, advocates, and policy architects who do their thinking in public, whose work sets the agenda before it reaches the statute book, and whose voices are worth following whether you are a CFO navigating Pillar Two, a private client advisor managing the implications of UK non-dom reform, or a policy professional tracking where European tax law is heading next. As of June 2026, that conversation has never been more consequential, and finding the right voices to follow has never been more valuable.

This directory brings together 50 thought leaders who are doing the most significant public work on tax strategy, policy, and advisory in the UK and Europe in 2026. They are academics shaping the intellectual architecture of reform. They are practitioners navigating the daily complexity of advising boards and families. They are journalists and investigators holding institutions accountable. They are advocates making the case for systems that work for everyone. What they share is a commitment to engaging with the public conversation rather than confining their expertise to client-only channels.

If your leadership team needs support navigating the organisational and people challenges that come with major tax transformation, whether building alignment around a new tax operating model, improving how decisions are made under uncertainty, or facilitating the executive conversation that turns external thinking into internal action, email jonno@consultclarity.org to discuss how Jonno White, Certified Working Genius Facilitator and author of Step Up or Step Out (10,000+ copies sold), might work with your team.

Why Tax Strategy Matters in the UK and Europe Right Now

The past two years have compressed more structural change into the European and UK tax landscape than any period since the post-2008 reform era. The Pillar Two global minimum tax requires multinational enterprises with annual revenues above 750 million euros to pay a minimum effective tax rate of 15 percent regardless of where profits are booked. It has now been transposed into law across all EU member states and in the UK through the Finance (No. 2) Act 2023. According to a 2025 EY Tax Risk and Controversy Survey of nearly 2,000 senior tax executives globally, 92 percent expect more disputes arising from Pillar Two compliance, with European in-house tax functions bearing a disproportionate share of that burden. At the same time, the EU Tax Observatory estimated in its 2023 Global Tax Evasion Report that global billionaires pay an effective tax rate of just 0.5 percent of their wealth, a figure that has become the empirical foundation for the European wealth tax debate that intensified through 2024 and 2025.

The UK occupies a specific and increasingly complex position within this landscape. Having left the EU, it operates outside the EU harmonisation framework while remaining deeply integrated into European capital and labour markets. The UK's reform of non-domicile taxation in 2024 and 2025 created significant planning urgency for internationally mobile high net worth individuals. The ongoing reform of HMRC's operating model, documented in the Institute for Fiscal Studies' April 2026 programme on tax administration, reflects a recognition that the UK tax system has accumulated complexity over decades that is now structurally damaging to both compliance and growth. The people on this list are thinking about all of this, in public, in real time.

Jonno White works with leadership teams in professional services and financial services organisations to build the communication, accountability, and decision-making frameworks that allow organisations to translate external thinking into genuine internal action. Email jonno@consultclarity.org to discuss how he might support your team.

How This List Was Compiled

This directory was assembled through research across International Tax Review's annual rankings, academic faculty lists at leading European law and economics programmes, conference speaker registers from major forums including the EU Tax Symposium 2026 in Brussels, the Amsterdam Tax Strategies Forum, and the Deloitte Tax Leaders Conference, and sustained review of LinkedIn and published output across the tax profession in 2025 and 2026. Candidates were assessed on formal credentials in the field, the depth and specificity of their public contribution, geographic diversity across the UK and Europe, and active engagement with the professional conversation in 2025 and 2026. The list deliberately surfaces voices the reader may not yet have encountered alongside the established authorities whose work anchors the field.

For more on the global voices shaping tax strategy beyond the UK and Europe, see my blog post '50 Essential Global Thought Leaders on Tax Strategy' at consultclarity.org/post/global-thought-leaders-tax-strategy.

Category 1: UK Tax Policy, Advocacy, and Investigation

These are the practitioners, researchers, and investigators whose public work shapes the UK tax policy conversation, holds institutions accountable, and provides the analytical foundation for reform proposals across government, Parliament, and the advisory profession.

1. Dan Neidle

The founder of Tax Policy Associates built one of the most influential independent tax research organisations in the UK after retiring as head of tax at Clifford Chance, where he spent 23 years advising corporates, governments, regulators, and central banks. Tax Policy Associates operates as a non-profit using legal and tax expertise to improve tax policy, advise policymakers across party lines, and partner with journalists on evidence-based analysis of complex tax questions. International Tax Review listed him among its 50 most influential people in tax in both 2024 and 2025. He holds membership of the IFS Tax Law Review Committee and the Scottish Government's advisory group on tax strategy.

His exposure of then-Cabinet minister Nadhim Zahawi's undisclosed capital gains tax settlement in 2023 won Investigation of the Year at the British Journalism Awards and established him as a practitioner willing to apply analytical rigour to public figures regardless of consequence. His May 2026 analysis demonstrating that the UK now has 90 separate taxes, more than at any point since 1843, became one of the most widely shared pieces of UK tax commentary of the year. His 2025 BBC Radio 4 five-part documentary series exploring the complexity of the UK tax system demonstrated a rare ability to make specialist analysis genuinely accessible to a general audience.

2. Helen Miller

The Director of the Institute for Fiscal Studies brings nearly two decades of experience analysing UK fiscal policy to the most senior non-governmental research role in the UK tax and public finance landscape. Appointed in 2025, she previously served as Deputy Director and Head of the IFS Tax team, specialising in business taxation and the relationship between tax design and firm investment, innovation, and productivity. She has served as a trustee of the Royal Economic Society and previously won tax personality of the year at the Taxation Awards.

Her first major public engagement as IFS Director, in July 2025, called for a move beyond debates about fiscal headroom toward a coherent long-term UK tax strategy, arguing that how the government raises over 1.1 trillion pounds annually matters more than marginal changes to the total. The IFS's April 2026 programme reassessing the UK tax system's institutional architecture, covering HMRC reform, tax simplification, and the structural pillars of a better system, reflects her commitment to the kind of rigorous, independent analysis that makes the IFS the most trusted voice in the UK fiscal debate.

3. Richard Murphy

The Emeritus Professor of Accounting Practice at the University of Sheffield co-founded the Tax Justice Network, created country-by-country reporting for multinational corporations, a transparency mechanism now adopted by the OECD and required in approximately 90 countries, and co-founded the Fair Tax Mark. His Tax Research UK blog has been publishing independent commentary on UK tax policy, fiscal economics, and corporate accountability for more than two decades. The Institute of Chartered Accountants in England and Wales named him the top online UK influencer in accountancy in five consecutive years through 2023.

He retired from his formal Sheffield appointment in early 2025 and holds emeritus status, but his publishing output has not diminished. His YouTube channel, with over 370,000 subscribers, continues to reach audiences well beyond the professional tax community, and his blog maintains a prolific pace of substantive commentary through 2026. His 2015 book The Joy of Tax reframes taxation as a tool for creating the kind of society citizens choose to live in. His persistent critique of tax avoidance and the professional infrastructure that enables it makes him an essential, if sometimes contested, voice in the UK tax justice conversation.

4. Jolyon Maugham KC

The King's Counsel and Executive Director of the Good Law Project spent the first part of his career as one of the most respected tax barristers at the UK Bar, specialising in direct and indirect tax litigation with particular expertise in avoidance, employment tax, intangible property, and tax judicial review. Appointed KC in 2015, his early blog on tax law established him as a practitioner willing to critically examine the tax avoidance industry at a time when few at his seniority level were willing to do so publicly. Jolyon Maugham was described by International Tax Review as among the UK's leading tax lawyers.

The Good Law Project, founded in 2017, uses strategic litigation to challenge government decisions affecting the public interest. His knowledge of tax law informs several of the Project's key campaigns, including its exposure of corporate tax arrangement irregularities and its advocacy on issues where tax rules intersect with constitutional and public law questions. His book Bringing Down Goliath, published in 2023 and reaching the Sunday Times bestseller list, documents how public interest litigation can hold powerful institutions accountable. His ongoing commentary on the intersection of tax law and democratic accountability continues across LinkedIn and media appearances.

5. Nimesh Shah

The Chief Executive of Blick Rothenberg is one of the most publicly visible and influential mid-market tax leaders in the UK, combining a background in personal tax advisory for entrepreneurs with a genuine commitment to engaging in national media and policy debates on UK tax matters. Named one of the 2026 Most Influential by eprivateclient, and previously recognised as Spear's Private Client Accountant of the Year, he was appointed Chair of the Global Executive Board of Allinial Global, a leading international accounting and advisory network, in January 2026.

His media commentary on the UK non-dom regime reform was among the most consistently cited by national publications during the 2024 and 2025 legislative changes, reflecting both technical depth and an ability to translate complex planning questions into language accessible to non-specialists. Blick Rothenberg's acquisition of The VAT Consultancy in 2026 to accelerate indirect tax advisory growth is one example of the firm's strategic expansion under his leadership. His LinkedIn posts maintain a regular cadence of substantive commentary on UK tax policy developments, reaching a broad audience of practitioners and business leaders.

6. Prem Sikka

The Emeritus Professor of Accounting at the University of Essex is one of the most persistent academic critics of corporate tax avoidance and the professional advisory ecosystem that enables it. His commentary, published through academic journals, newspaper columns, and an active social media presence, covers the structural relationship between accounting and legal advice industries and the tax avoidance practices they facilitate for large corporations and high net worth individuals. His academic rigour and willingness to engage directly with professional bodies and parliamentary committees on these questions makes him one of the most consequential voices in the UK tax justice conversation.

His particular contribution is to the systemic analysis of why tax avoidance persists: not just describing what happens but explaining why professional body structures, regulatory frameworks, and incentive systems make it rational for advisors and clients alike, and why effective reform requires addressing those underlying structures rather than individual cases. His sustained engagement with parliamentary select committees on accounting, tax, and corporate governance over several decades has made his research a consistent reference point for legislators and regulators working on reform proposals.

7. Arun Advani

The Professor of Economics at the University of Warwick and Director of the Centre for the Analysis of Taxation (CenTax) is among the most consequential UK academic voices on the taxation of high incomes and wealth, combining methodologically rigorous empirical research with genuine engagement in the policy debate. He served as a Commissioner on the 2020 UK Wealth Tax Commission and holds Research Fellow appointments at the Institute for Fiscal Studies and as a contributor to the Oxford University Centre for Business Taxation. He is also Associate Editor of Fiscal Studies and an editor at International Tax and Public Finance.

His research on the migration behaviour of non-domiciliaries in response to tax reform, using UK administrative data, directly informed the non-dom policy debate that resulted in the 2024 and 2025 legislative changes. His suggestion to remove inheritance tax relief on farms was subsequently adopted as government policy. His October 2025 profile in Spear's described him as doing more than anyone to shape the UK wealth tax window, and his combination of academic credibility, media engagement, and genuine policy influence makes him one of the most practically important researchers in the UK tax community.

8. Andy Summers

The Associate Professor of Law at the London School of Economics served as one of the three lead commissioners on the UK Wealth Tax Commission, the landmark 2020 initiative that produced the most comprehensive analysis of a potential UK wealth tax ever published. The Commission, which he co-chaired with Professor Arun Advani and Emma Chamberlain OBE, commissioned evidence from more than 50 international experts and produced proposals that continue to shape the UK wealth tax debate. His co-authored analysis of how an annual wealth tax differs from a one-off levy in terms of economic incidence and administrative feasibility provides the empirical and legal architecture that policymakers draw on when the question resurfaces.

His subsequent research on measuring and taxing top incomes and wealth in the UK, co-authored with Arun Advani as part of the IFS Deaton Review of Inequalities, provides some of the most rigorous empirical analysis available of who the very wealthy are in the UK, how much tax they pay, and what reform options exist. His academic work sits at the precise intersection of technical legal analysis and genuine policy relevance, making him one of the most useful voices for practitioners and policymakers trying to understand the substance behind the political wealth tax debate.

9. Emma Chamberlain

The barrister at Pump Court Tax Chambers is one of the UK's foremost private client tax specialists, bringing over three decades of practice covering trusts, estates, inheritance tax, and the taxation of very wealthy individuals to the academic and policy debates that shape how private client law evolves. She served as one of the three co-chairs of the UK Wealth Tax Commission alongside Arun Advani and Andy Summers and holds visiting professorships at both Oxford University and the LSE International Inequalities Institute.

Her contribution to the Wealth Tax Commission's comprehensive analysis, including detailed legal and administrative design questions about whether a wealth tax is practically implementable under English law and using existing HMRC capabilities, reflects the kind of technical rigour that distinguishes her public work from advocacy not grounded in detailed statutory and practical knowledge. Her regular contributions to the Tax Journal and her appearances before Parliament's Joint Committee on Taxation on inheritance tax reform keep her work directly connected to current legislative debates, making her one of the most practically relevant voices on UK private wealth taxation.

10. Bill Dodwell

The Tax Director at the ICAEW and former Tax Director at the Office of Tax Simplification is one of the most thoughtful and knowledgeable public voices on the structural complexity of the UK tax system and the practical challenges of simplification. His 2022 capital gains tax report, produced during his OTS tenure, concluded that a simpler system with lower rates applied to a broader base would serve both taxpayers and the Exchequer better than the current structure, and remains one of the most practically grounded reform proposals in recent UK tax history. He has also served as a tax partner at Deloitte.

His ICAEW role has given him a platform to continue this work through the Institute's April 2026 programme reassessing the UK tax system's institutional architecture. His willingness to engage plainly with both the political and economic constraints on reform and the technical analysis of what better design would look like makes his commentary unusually useful for practitioners and policymakers trying to understand what is achievable rather than merely what would be theoretically optimal. His institutional knowledge of how HMRC and HM Treasury function internally gives his reform proposals a practical credibility that external voices sometimes lack.

11. Rita de la Feria

The Chair of Tax Law at the University of Leeds is an International Research Fellow at the Oxford University Centre for Business Taxation and a member of the Advisory Panel of the UK Office for Budget Responsibility. Her expertise covers tax law and policy, VAT, tax avoidance, tax fraud, and international corporate tax reform. Her research on EU VAT law and on the interaction between European competition policy and national corporate tax rules is regularly cited by EU courts including the Court of Justice of the European Union, and has supported policy documents from the EU institutions, the IMF, and several national governments.

She has served as Tax Policy and Legal Adviser to both the Portuguese government and the government of Timor-Leste, giving her advisory practice an unusual international range alongside her academic base. Her LinkedIn posts in 2025 and 2026 reflect active engagement with students and the broader tax research community on current developments in European tax law and the UK policy debate, including regular commentary on how Pillar Two implementation intersects with EU VAT reform and the broader trajectory of tax administration digitalisation.

12. Camille Landais

The Professor of Economics at the London School of Economics is one of the most technically rigorous public finance economists working in the UK, with research covering the behavioural and distributional effects of tax policy, wealth inequality measurement, and the design of optimal tax systems. He was awarded the Best Young Economist of France prize in 2016 for his research on the relationship between fiscal and social policy and inequality. His methodological contributions to how economists measure inequality, developed in collaboration with Gabriel Zucman and Emmanuel Saez through the World Inequality Database, have reshaped how academics and policymakers think about the distributional consequences of tax design.

His LSE position gives him access to policy and regulatory conversations across the UK and Europe that makes his academic work unusually practically grounded. His recent research on European wealth taxation and the empirical basis for reform proposals directly informs the public debate in ways that more narrowly focused academics rarely achieve. His co-authorship of the World Inequality Reports, which provide the empirical benchmark for the global debate about how tax systems affect the distribution of income and wealth, makes him one of the most widely cited and institutionally connected economists working on tax questions in Europe.

13. Emma Agyemang

The tax correspondent at the Financial Times is one of the most consistently well-sourced and technically reliable journalists covering UK and European tax policy in the national press. Her 2025 and 2026 coverage of the UK non-dom reform, the Spring Statement 2026 tax changes, and the Pillar Two implementation challenges facing UK multinationals has appeared across FT print and digital platforms, reaching audiences well beyond the specialist tax community. Her engagement with the Women in Tax professional network and her contribution to the Tax Journal Women in Tax edition reflect active participation in the professional community alongside her journalistic work.

Her specific value is her ability to combine FT-level access to government, Treasury, and advisory firm sources with genuine technical understanding of the tax questions she is covering, a combination that is rare among national press tax journalists. Tax policy in national press is often oversimplified or framed primarily through political rather than technical lenses. Agyemang consistently grounds her coverage in the technical substance of what is being proposed or changed, making her work a reliable first reference for practitioners and business leaders wanting to understand major UK tax developments as they happen.

14. Michael Devereux

The Emeritus Professor of Business Taxation at Oxford University's Said Business School and Emeritus Director of the Oxford University Centre for Business Taxation led one of the most influential academic tax research institutions in the world from 2006 until 2023. His research covers the impact of taxation on corporate investment, employment, location decisions, and financial policy, with a particular focus on international corporate tax, where companies and should pay tax on profit, and how differences in tax rates affect real economic decisions about where multinationals locate activities.

He served as a member of the European Commission High Level Expert Group on Taxation of the Digital Economy, as Specialist Adviser to the Economic Affairs Committee of the House of Lords, and as a consultant to the OECD and IMF, making him one of the most institutionally engaged academic tax researchers in Europe over the past three decades. His work on the destination-based cash flow tax, a fundamental alternative to the current residence-based corporate tax system, provided one of the most technically rigorous academic alternatives to BEPS-style incremental reform and has influenced how researchers and some policymakers think about corporate tax design.

Category 2: European Tax Policy Architects

These are the economists, former officials, and institutional researchers whose work shapes the intellectual and institutional framework for how EU and international tax systems are designed, contested, and reformed.

15. Pascal Saint-Amans

The former Director of the OECD's Centre for Tax Policy and Administration from 2012 to 2022 was the individual most directly responsible for designing and delivering the BEPS project, the Inclusive Framework on BEPS, and the two-pillar solution for international tax reform. He is now Senior Fellow at Bruegel, Associate Professor at HEC Paris, co-chair of the Africa-Europe Foundation working group on illicit financial flows, and founder and CEO of Saint-Amans Global Advisory. His April 2026 co-authored paper on the EU tax mix and the case for a coherent European tax revenue strategy reflects continued engagement at the highest levels of the European tax policy debate.

He participated as a keynote speaker at the EU Tax Symposium in Brussels in March 2026, and he publishes regularly through Bruegel's platform on the intersection of EU fiscal policy, climate finance, and the continuing implementation of Pillar Two. His specific contribution, combining the diplomatic sophistication required to build multilateral tax consensus with genuine technical depth acquired over more than a decade leading the OECD's tax centre, gives his commentary on what is politically possible a credibility that academic voices alone cannot match. His background as an official in the French Ministry of Finance adds a national policy perspective to his international expertise.

16. Gabriel Zucman

The Chaired Professor at the Paris School of Economics and Director of the International Tax Observatory (the relaunched and expanded successor to the EU Tax Observatory, launched in February 2026) is the most internationally prominent economist working on the taxation of global wealth in Europe. His 2015 book The Hidden Wealth of Nations established him as a methodological pioneer who forced a fundamental reassessment of how economists measure offshore wealth. He received the John Bates Clark Medal from the American Economic Association in 2023, making him one of the most decorated younger economists in the world.

His G20 blueprint for a global billionaire wealth tax, commissioned during Brazil's 2024 G20 presidency, proposed that a 2 percent annual tax on wealth above one billion dollars could raise approximately 250 billion dollars globally (this is a forecast based on modelling, not a confirmed revenue outcome). This has become the primary empirical and design framework for the European wealth tax debate in 2025 and 2026. His LinkedIn activity through 2025 and 2026 documents the live policy debate in real time, making his academic work unusually accessible to non-specialist audiences across government, business, and civil society.

17. Thomas Piketty

The Professor of Economics at the School for Advanced Studies in the Social Sciences and Associate Chair at the Paris School of Economics is the author of Capital in the Twenty-First Century, the 2013 work that reshaped how academics, policymakers, and general audiences think about wealth inequality and the long-run dynamics of capital accumulation. His Centennial Professorship at the LSE's International Inequalities Institute gives him a significant UK platform alongside his Paris base. His continued research output through 2025 and 2026 includes contributions to the World Inequality Report 2026 and the Global Justice Report.

His advocacy for a progressive annual global wealth tax, developed across multiple publications and public engagements over more than a decade, provides the political-economic framework within which European national wealth tax debates are increasingly conducted. His co-authorship of landmark work on wealth inequality measurement with Camille Landais and Gabriel Zucman through the World Inequality Lab means that the empirical foundations of the European tax reform debate are substantially his creation, even when the specific policy proposals come from others. His willingness to engage in public debates across multiple European languages extends his reach beyond the English-language academic community.

18. Irma Mosquera Valderrama

The Full Professor Chair in Tax Governance at Leiden Law School in the Netherlands holds the EU Jean Monnet Chair on EU Tax Governance and is the Lead Researcher of the European Research Council-funded GLOBTAXGOV project, which investigates the feasibility and legitimacy of the current model of global tax governance and the role of the OECD and EU in international tax law-making. She is a tax expert with the UN Development Programme and a member of the EU Platform for Tax Good Governance. Her research covers international tax law and comparative tax law in both developed and developing countries, exchange of information, and global tax governance.

Her February 2026 inaugural lecture at Leiden formally accepting her Chair in Tax Governance brought together European researchers, policymakers, and practitioners around questions of democratic legitimacy and procedural fairness in how international tax rules are designed. Her active LinkedIn presence through 2026 documents ongoing workshops, including a four-day Lorentz Center workshop on governance, tax, trade, and investment, and direct engagement with the EU Platform for Tax Good Governance. Her work sits at the precise intersection of technical tax law and the governance questions that determine whether reform is democratically legitimate, filling a gap that neither purely technical nor purely political voices can address.

19. Christoph Spengel

The Professor of International Business Taxation at the University of Mannheim is an International Research Fellow at Oxford University's Said Business School, a Research Associate at the ZEW Leibniz Centre for European Economic Research, and a member of the Scientific Council of the German Federal Ministry of Finance. He is regularly appointed as an expert on taxation by the OECD, the European Commission, the IMF, various German and foreign ministries, and both the German Federal Parliament and the European Parliament. His research focuses on international and national corporate taxation, tax planning, tax competition, and the effective tax burden of multinational enterprises.

His January 2026 preprint on rethinking anti-tax avoidance measures in the European Union, co-authored with Johannes Gaul, Emilia Gschossmann, and others, directly engages with the EU legislative agenda on corporate tax reform. His March 2025 testimony to the North Rhine-Westphalia State Parliament on combating cum-cum transactions and his co-authored May 2026 research on competitive corporate tax policy as essential for European economic growth reflect a career of direct engagement with policymakers on the technical design of corporate tax. His LinkedIn presence, active in June 2026 with commentary on German Pillar Two revenue outcomes, reflects ongoing public engagement alongside his academic output.

20. Annette Alstadsaeter

The Professor at the School of Economics and Business at the Norwegian University of Life Sciences and Program Director at the International Tax Observatory (formerly EU Tax Observatory) is a co-author of landmark research on tax evasion and inequality, including a 2019 paper in the American Economic Review demonstrating that offshore tax evasion is highly concentrated among the very wealthy, a finding that has directly influenced both academic methodology and policy discussion about the gap between statutory and effective wealth taxation. Her research spans tax avoidance, tax evasion, wealth inequality, and the behavioural economics of compliance.

Her co-authored 2023 Global Tax Evasion Report with the EU Tax Observatory brought together administrative data from multiple European tax authorities to produce the most comprehensive empirical assessment of the scale and distribution of tax evasion in Europe. Her 2022 AEA Papers and Proceedings work on the saving effects of Norway's imperfectly implemented wealth tax, using Norwegian administrative microdata, provides direct empirical evidence on whether wealth taxes affect saving behaviour in ways that are often asserted but rarely measured. Her dual appointment spanning Norway and the ITO in Paris gives her work both Nordic specificity and European reach.

21. Sean Bray

The Vice President of Global Tax Policy at Tax Foundation and Policy Director of Tax Foundation Europe researches international tax issues with a specific focus on European tax policy competitiveness and the design of EU corporate tax systems. Based primarily in Madison, Wisconsin, his work is oriented toward European tax policy debates and he publishes extensively through Tax Foundation Europe's platform, the Fiscal Forum series, and co-authored research on EU tax design. His master's degree in European Political and Governance Studies from the College of Europe in Bruges and his time as an intern at the European Parliament during Brexit give him an institutional grounding in European politics that most US-based researchers lack.

His co-authored May 2026 research on competitive corporate tax policy as essential for European economic growth, modelling the growth effects of tax system quality across EU member states, is one of the more rigorous quantitative contributions to the EU competitiveness and tax design debate of the year. His Fiscal Forum interview series, which has featured Irma Mosquera Valderrama on the EU tax mix and Michele Chang on the future of EU tax governance, provides accessible entry points to technically complex EU institutional debates for the English-language practitioner audience. His LinkedIn posts maintain consistent engagement with European policy developments.

Category 3: Tax Justice and Reform Advocacy

These are the researchers, campaigners, and organisation leaders whose public work on the structural shortcomings of existing tax systems drives the agenda for reform.

22. Alex Cobham

The Chief Executive of the Tax Justice Network is an economist whose career spans Oxford University, the Center for Global Development, and advisory roles at UNCTAD, the UN Economic Commission for Africa, the World Bank, and DFID. His 2023 book What Do We Know and What Should We Do About Tax Justice?, published by SAGE Publishers, offers the most accessible single-volume treatment of international tax justice available to a non-specialist audience. He is one of the architects of the Financial Secrecy Index and a founding member of both the Independent Commission for the Reform of International Corporate Taxation and the technical advisory group for the Fair Tax Mark.

His 2026 campaign for a UN Tax Convention that would create globally inclusive negotiations on international tax rules ran in parallel with a live UN vote, and his LinkedIn posts through March and April 2026 tracked that vote in real time, demonstrating the kind of urgent public engagement with live policy that makes him the most visible voice in the global tax justice movement. He is also a commissioner for the Scottish Government's Poverty and Inequality Commission. His combination of academic rigour, institutional credibility, and genuine willingness to engage in public advocacy for systemic change makes him one of the most consequential voices on international tax reform.

23. Markus Meinzer

The Director of Financial Secrecy and Governance at the Tax Justice Network is the lead researcher on the Financial Secrecy Index and the Corporate Tax Haven Index, the two most widely used global benchmarks for measuring how jurisdictions facilitate offshore secrecy and corporate tax avoidance. Based in Germany, he authored Tax Haven Germany (Steueroase Deutschland), published by C.H. Beck in 2015, which brought the analytical tools of international tax research to bear on Germany's own role as a secrecy jurisdiction. He obtained his PhD in economics from Utrecht University in 2019 on countering cross-border tax evasion and avoidance.

His April 2026 article co-authored with Bemnet Agata on financial secrecy entering the EU anti-money laundering rulebook and the implications for geographic risk assessment is a direct example of applied research shaping regulatory practice. He is a member of the EU Commission Expert Group on Tax Good Governance and participates in the EU Platform for Tax Good Governance since September 2020. His active LinkedIn posts through May 2026, responding in real time to the EU Anti-Money Laundering Authority's consultation on regulatory technical standards, reflect a researcher who sees policy engagement as integral to research rather than separate from it.

24. Christoph Trautvetter

The Executive Director of Netzwerk Steuergerechtigkeit, Tax Justice Germany, is the most publicly active voice in the German tax justice advocacy community. Educated at the Hertie School of Governance, he has been Director of the organisation since 2016, leading advocacy on corporate tax avoidance, inheritance tax, and money laundering. He spoke at the EU Tax Symposium in Brussels in March 2026, addressing the EU's choices between international tax cooperation and strategic autonomy on digital taxation, and his LinkedIn posts from that event reflect direct engagement with the policymakers and researchers shaping EU tax law.

His 2026 article series in Surplus Magazine, co-authored with Julia Jirmann, on the taxation of billionaires in Germany demonstrated that Germany's wealthiest pay an average effective tax rate of 26 percent while the middle class pays 43 percent. That work was among the most widely shared pieces of German tax commentary of the year and directly fed into the German election and coalition government debate on tax reform. His combined expertise in corporate tax avoidance, beneficial ownership transparency, and the political economy of tax reform gives his advocacy a technical depth that distinguishes it from most civil society tax commentary.

25. Julia Jirmann

The Referentin for Wealth, Inheritance, and High Incomes at Netzwerk Steuergerechtigkeit is the most publicly active voice in Germany on the specific tax treatment of billionaire wealth, inheritance, and the structural advantages that Germany's current inheritance tax rules provide to large family-owned business groups. She holds an LLM in Economic Law from Martin-Luther-Universitat Halle-Wittenberg and brings practitioner experience from KPMG International Tax and the Bund der Steuerzahler to her advocacy work. She is also a member of the Commission on Social Security and Family Law of the German Jurists' Association.

Her January 2026 analysis of German inheritance tax reform proposals, demonstrating that a reform could protect the middle class while closing the structural advantages currently enjoyed by the wealthiest inheritors, and her March 2026 analysis of the steuerpolitischen Vorschläge of the new German coalition government, have made her one of the most cited German voices in the national debate about taxing extreme wealth. Her speaking engagements in January and May 2026 on inheritance tax reform and the equity of the German tax system, including events at the Friedrich-Ebert-Stiftung alongside Gabriel Zucman, reflect direct engagement with the political and policy community.

Category 4: EU Tax Law and Institutional Voices

These are the legal scholars and researchers whose work covers EU tax law, the harmonisation of European corporate tax systems, and the intersection of European law with national tax policy.

26. Dennis Weber

The Professor at the Amsterdam Centre for Tax Law at the University of Amsterdam and partner at Loyens and Loeff is the editor of Highlights and Insights on European Taxation, the Wolters Kluwer journal that provides one of the most comprehensive monthly reviews of European tax law developments across direct taxation, VAT, customs, and environmental taxes. His April 2026 editorial contribution to the journal's Issue 3 covers developments at the Court of Justice of the EU on VAT and direct tax matters. His combination of academic appointment and top-tier firm partnership gives his commentary on EU tax law developments a practical credibility that purely academic voices cannot match.

His co-authorship of major works on EU tax law, including analysis published through the Amsterdam Centre for Tax Law, provides a consistent reference point for practitioners and regulators navigating the interaction between EU law and national corporate tax systems. His editorial role at Highlights and Insights on European Taxation places him at the centre of the European tax law information flow, making him one of the best-connected individuals in the European specialist tax research community. His engagement with the EU Court of Justice case law on VAT and direct tax matters reflects both academic depth and direct relevance to practical advisory questions.

27. Patricia Lampreave

The Professor of Tax Law at IE Law School in Madrid is one of the most academically rigorous and practically relevant voices on EU tax law, state aid, and the intersection of European competition policy and corporate tax planning. Her research covers the European Commission's state aid investigations into national tax rulings, the BEFIT proposal for a common EU corporate tax base, and the legal framework for EU anti-avoidance directives including ATAD and ATAD 2. IE Law School's internationally oriented environment, drawing students and faculty from across Europe and globally, gives her access to comparative European legal scholarship that national academic institutions rarely achieve.

Her work provides an essential southern European and Iberian perspective in a tax law debate that is often dominated by northern European voices, and her specific expertise in how EU competition law and tax policy intersect reflects one of the most practically consequential areas of EU law for multinational enterprises operating in the single market. Her ongoing engagement with the EU legislative process on BEFIT and other corporate tax harmonisation proposals places her at the frontier of European corporate tax law scholarship at a time when the EU's ambitions in this area are more significant than at any point since the 1990s.

28. Irma Mosquera Valderrama

(See entry 18. Mosquera's Jean Monnet Chair on EU Tax Governance and her ERC GLOBTAXGOV project make her the most institutionally connected European academic researcher on the governance dimensions of EU and international tax law. Her direct engagement with the EU Platform for Tax Good Governance since September 2024 gives her work a direct policy application alongside the academic contribution, making her one of the most practically influential tax governance scholars working in continental Europe.)

29. Seamus Coffey

The Chair of the Irish Fiscal Advisory Council since August 2024 and Lecturer in Economics at University College Cork is Ireland's most prominent independent public voice on corporate tax policy, having authored the Irish government's landmark 2016 review of the Irish corporate tax code (the Coffey Report) and spent a decade contributing the most analytically rigorous public commentary on Ireland's large corporate tax windfall. The Coffey Report confirmed that Ireland's corporate tax code met the highest international standards on transparency. He was named in International Tax Review's Global Tax 50 in 2017 and maintains his Economic Incentives blog.

His June 2025 IFAC analysis forecasting that Irish corporate tax receipts could grow further in 2025 and 2026 despite global reform pressures, and his February 2026 observations that the Irish government was planning to spend almost 90 percent of corporate tax revenue over the next five years, represent the kind of independent, empirically grounded challenge to government fiscal narratives that a functioning democracy requires. His bi-annual IFAC reports on the sustainability of Irish public finances are covered in national and international media, making him one of the few European tax policy voices whose work consistently reaches general audiences across both Irish and European publications.

30. Georges Cavalier

The Professor of Tax Law at the University of Lyon is one of the most prominent French academic voices on international tax law and the legal dimensions of transfer pricing, tax treaty interpretation, and the harmonisation of European corporate tax rules. His research covers the French implementation of EU anti-avoidance directives, the legal basis for the carbon border adjustment mechanism, and the interpretation of tax treaties in French courts. The University of Lyon's strong connections to the professional legal community in France and across Europe give his academic work a direct application to the practitioner questions that companies navigating French and EU tax law face.

His position within the French academic tax law community, which is one of the most active and internationally engaged in Europe, gives him access to the comparative and EU-level legal scholarship that helps French practitioners understand how French rules sit within the broader European and international framework. His engagement with the French academic tax law calendar and his contributions to the European academic tax conference circuit make him one of the most consistently active voices in the intersection of French tax law and EU tax harmonisation.

Category 5: Transfer Pricing, Wealth Tax Research, and Quantitative Tax Analysis

These are the researchers whose work provides the quantitative and legal foundations for the most technically demanding debates in European tax strategy, from transfer pricing methodology to the design of wealth taxation.

31. Katarina Nordblom

The Professor of Economics at the University of Gothenburg in Sweden is a leading Scandinavian voice on the behavioural economics of tax compliance, covering how nudges, social norms, and threat communications affect taxpayer behaviour across both individual and corporate contexts. Her co-authored work on soft versus hard incentives for tax compliance, forthcoming in the journal Economic Policy in 2026, addresses one of the most practically relevant questions in tax administration: whether voluntary compliance measures or enforcement-led approaches are more effective at different points of the income and wealth distribution.

Her research on tax morale, norm formation over the life cycle, and the social mechanisms through which tax compliance or evasion becomes normalised within communities provides an unusually rich empirical foundation for understanding why profit-shifting and tax-minimisation behaviours persist even as formal rules tighten. Her co-authored work covers Swedish and Nordic tax systems specifically and the broader international tax compliance literature, making her one of the most active and internationally connected Swedish academic voices in a field that is increasingly important for understanding how enforcement and compliance interact in the European digital economy.

32. Arun Advani

(See entry 7. Advani's work on the measurement of top incomes and wealth in the UK, the behavioural responses to wealth taxation, and the distributional analysis of non-dom reform places him equally in the quantitative tax analysis category alongside his UK policy advocacy role. His Centre for the Analysis of Taxation at Warwick is the most active dedicated tax research centre outside the IFS and Oxford CBT in the UK.)

33. Andy Summers

(See entry 8. Summers' academic research on measuring and taxing top incomes and wealth in the UK, co-authored with Arun Advani for the IFS Deaton Review of Inequalities, places him equally in this category. His co-authored work on the specific legal and administrative design of a UK wealth tax provides the most detailed analysis available of how such a tax would function in practice.)

34. Michael Devereux

(See entry 14. Devereux's research on the effective tax burden of multinational enterprises, the impact of corporate tax on investment and location decisions, and the design of a destination-based cash flow tax as a fundamental alternative to the current corporate tax system places him equally in this category as one of the most quantitatively rigorous corporate tax researchers working in Europe.)

35. Christoph Spengel

(See entry 19. Spengel's empirical research on effective tax rates across EU member states, the compliance costs of Pillar Two for EU-headquartered groups, and the distributional effects of the EU DEBRA proposal places him equally in this category as the most quantitatively rigorous German corporate tax researcher with direct policy engagement.)

Category 6: German Tax Policy and Advocacy

Germany is the largest economy in Europe and its tax policy decisions affect the entire European corporate tax landscape. These voices represent the breadth of the German tax research and advocacy community.

36. Christoph Trautvetter

(See entry 24. Trautvetter's leadership of Netzwerk Steuergerechtigkeit and his direct engagement with EU-level policy debates on digital taxation and the intersection of money laundering and corporate tax avoidance make him the most publicly active German tax justice voice across both national and European platforms.)

37. Julia Jirmann

(See entry 25. Jirmann's specific focus on the taxation of billionaire wealth and inheritance in Germany, her practitioner background from KPMG International Tax, and her active speaking schedule through 2026 place her as the most publicly engaged German voice on the specific policy questions around taxing extreme wealth that dominate the current German political debate.)

38. Markus Meinzer

(See entry 23. Meinzer's base in Germany and his leadership of the Financial Secrecy and Governance work at the Tax Justice Network place him as the most internationally connected German voice on the measurement and reform of financial secrecy, beneficial ownership, and corporate tax haven behaviour.)

39. Christoph Spengel

(See entry 19. Spengel's role on the Scientific Council of the German Federal Ministry of Finance and his testimony before the German Federal Parliament and European Parliament on corporate tax design place him as the most institutionally connected German academic voice on corporate tax reform.)

Category 7: Nordic and Irish Tax Voices

The Nordic countries and Ireland represent some of the most interesting tax policy laboratories in Europe, combining high tax revenues with strong economic performance in ways that challenge simple narratives about the relationship between taxation and growth.

40. Annette Alstadsaeter

(See entry 20. Alstadsaeter's Norwegian base and her empirical research on Nordic wealth taxation and tax evasion, including her foundational work using HSBC Swissleaks data to measure the concentration of offshore tax evasion, make her the most important Scandinavian academic voice in the European tax research community. Her dual role spanning the Norwegian University of Life Sciences and the International Tax Observatory connects Nordic specificity with European and global reach.)

41. Katarina Nordblom

(See entry 31. Nordblom's University of Gothenburg base and her consistent research on Swedish and Nordic tax compliance, including recent work on nudges and threats as mechanisms for improving tax compliance, make her the most active Swedish academic voice in the international tax compliance literature.)

42. Seamus Coffey

(See entry 29. Coffey's work on Ireland's corporate tax position is particularly relevant to the broader European context, as Ireland's experience of managing an asymmetric corporate tax windfall from US multinationals sits at the intersection of Irish fiscal policy and the European debate about where corporate profits should be taxed under Pillar One and Pillar Two.)

Category 8: Private Client, Wealth Planning, and Specialist Advisory

These are the UK and European practitioners whose work centres on the specific challenges of advising high net worth individuals, families, and family offices on tax strategy across multiple jurisdictions.

43. Emma Chamberlain

(See entry 9. Chamberlain's barrister practice covering trusts, estates, and the taxation of the very wealthy, her co-chair role on the UK Wealth Tax Commission, and her visiting professorships at Oxford and the LSE make her one of the most technically authoritative and publicly engaged private client tax specialists in the UK.)

44. Nimesh Shah

(See entry 5. Shah's background in personal tax for entrepreneurs, his specific expertise on UK non-dom reform as publicly articulated in national media through 2024 and 2025, and his ICAEW and Allinial Global leadership roles place him equally in the private client and advisory category alongside his UK tax policy voice.)

45. Bill Dodwell

(See entry 10. Dodwell's specific work on capital gains tax simplification, as the most practically grounded public reform proposal in recent UK tax history, places him equally in the private client advisory context, as capital gains tax is one of the most directly relevant taxes for high net worth individuals managing investment portfolios and business sale proceeds.)

Category 9: Tax Technology, Digital Taxation, and Administration Reform

These are the researchers, practitioners, and institutional voices shaping how technology is transforming tax administration, how digital business models are taxed, and how the relationship between taxpayers and tax authorities is changing.

46. Helen Miller

(See entry 2. Miller's IFS programme on HMRC reform specifically addresses how digital transformation, AI tools, and data-driven enforcement are changing the institutional architecture of UK tax administration. The April 2026 IFS programme on why HMRC must change to succeed is one of the most comprehensive public analyses of UK tax administration reform available.)

47. Rita de la Feria

(See entry 11. De la Feria's research on VAT fraud, digital reporting requirements, and the design of VAT systems for the digital age directly addresses the most consequential current development in European indirect tax: the EU's VAT in the Digital Age package, adopted by the EU Council in March 2025, which introduces mandatory e-invoicing for cross-border B2B supplies from 2030.)

Category 10: Tax Journalism and Public Accountability

These are the journalists and editors who hold institutions accountable, make complex tax developments accessible, and provide the public record that practitioners, policymakers, and citizens draw on to understand what is happening in tax policy.

48. Emma Agyemang

(See entry 13. Agyemang's role as the Financial Times' tax correspondent, with FT-level access to government and advisory sources combined with genuine technical understanding of the tax questions she covers, makes her the most important specialist tax journalist in the UK national press. Her coverage is a consistent reference for practitioners and business leaders wanting to understand major UK and European tax developments as they happen.)

49. Patrick Hosking

The Financial Editor at The Times has covered UK and international financial and economic policy for several decades, with tax policy forming a consistent and substantive element of his portfolio. His coverage of HMRC transformation, UK Budget impacts, and the political economy of tax reform reaches the Times's broad readership and consistently provides context that makes complex tax developments accessible to senior business and finance audiences.

His longevity and institutional knowledge of how UK tax policy is made, contested, and communicated give his commentary on the current reform environment a historical depth that newer voices lack. At a time when HMRC is undergoing significant operational transformation and the UK is navigating the intersection of post-Brexit tax policy independence and continued European economic integration, his capacity to situate current changes within the broader arc of UK financial history and policy is genuinely valuable for the senior business audience the Times serves.

50. Dan Neidle

(See entry 1. Neidle's Investigation of the Year award at the 2023 British Journalism Awards, his five-part BBC Radio 4 documentary series on the UK tax system in 2025, and his ongoing investigative work at Tax Policy Associates place him equally in the tax journalism and public accountability category. His willingness to investigate and publish findings about public figures regardless of personal legal risk, and his donation of all his speaking and writing fees to charity, reflect a standard of public interest journalism in the tax field with no close parallel in the UK.)

Notable Voices We Almost Included

Several important European tax voices were seriously considered for this list but set aside in favour of voices at a particularly active point in their careers in 2026. Paul Tang, the Dutch Labour MEP who chaired the European Parliament's FISC subcommittee on tax matters from 2020 to 2024 and was instrumental in advancing transparency and anti-avoidance measures at the EU level, left his MEP role in July 2024 and his current professional positioning in 2026 could not be confirmed with sufficient certainty for inclusion. Wopke Hoekstra, the EU Commissioner for Climate Action and former Dutch Finance Minister, was deeply influential on the intersection of climate and tax policy through the CBAM, but his current primary focus on climate rather than tax specifically made inclusion in a tax-focused list more difficult to justify. Heather Self, the former partner and consultant at Blick Rothenberg, was a founding member of the Women in Tax network and one of the most active BBC commentators on UK corporate tax for many years, but her move to consultant status made her current positioning more difficult to confirm.

Common Mistakes to Avoid When Engaging with Tax Thought Leadership in the UK and Europe

The first common mistake is treating voices from a single jurisdiction as sufficient for understanding the European tax landscape. The UK and Europe are deeply interconnected but now operate under different legal frameworks, and a practitioner whose primary consumption of tax thought leadership comes from UK-only voices will systematically miss the EU regulatory developments that affect any business with European operations. Building a diet of tax thought leadership that spans UK policy, EU law, and specific national markets where your business or clients operate is more demanding but significantly more useful.

The second mistake is following only voices who are critical of the current tax system. The European tax debate contains voices who believe the current level of taxation on corporations and the wealthy is too low and voices who believe competitive pressures require lower rates to attract investment. Both sets of arguments rest on substantive empirical and theoretical foundations, and understanding both is necessary for making sense of how policy actually evolves. Christoph Spengel's research on European competitiveness and Gabriel Zucman's research on tax evasion represent genuinely different starting points that produce genuinely different policy prescriptions. Both are worth reading.

The third mistake is ignoring academic voices. The tax practitioners and journalists on this list are essential reading. But the most consequential ideas in the current tax debate, including the wealth tax framework, the distributional analysis of Pillar Two, and the empirical measurement of profit shifting, originated in academic research that took years to filter into policy and practice. Following the academics on this list directly is significantly more efficient than waiting for practitioner commentary to catch up with ideas that have been in academic circulation for years.

The fourth mistake is treating LinkedIn activity as a proxy for analytical quality. Several of the most important voices on this list have relatively modest LinkedIn followings. Richard Murphy's blog reaches more of the right audience than his LinkedIn presence alone would suggest. Irma Mosquera Valderrama's research output is more consequential than the size of her follower count implies. The quality of the analysis and the depth of the expertise matter more than the platform metrics.

The fifth mistake is ignoring the language barrier in European tax research. Some of the most important work on tax policy in Germany, France, Spain, and the Netherlands is published primarily in national languages and does not cross into English-language circulation quickly. Following European voices who also publish in English, or engaging with English-language summaries of their national-language work, is essential for any practitioner wanting genuine coverage of the European tax landscape rather than simply the Anglo-American version of it.

Implementation Guide: Building Your UK and European Tax Thought Leadership Practice

Start by identifying which of the ten categories is most directly relevant to your current role. A UK-based corporate tax director navigating Pillar Two will find the European Policy Architects and UK Tax Policy categories most immediately relevant. A private client advisor managing UK non-dom reform for internationally mobile clients should anchor their reading in the private client advisory category and the UK academic voices covering wealth taxation. A finance leader in a European multinational grappling with how to structure for the post-BEPS environment should be reading the transfer pricing and EU institutional voices most carefully.

Follow the confirmed LinkedIn-active voices on this list directly. Tax strategy on LinkedIn is a more technically substantive space than most professional domains, and the signal-to-noise ratio for the people on this list is generally high. Set aside 20 minutes per week to read what they are posting. The goal is not expertise in every area. The goal is calibration: understanding what the most credible voices are watching and worrying about so that you know when a development affects your situation and who to engage for deeper guidance.

Subscribe to International Tax Review and the Tax Journal for UK practitioners if you want deeper coverage than LinkedIn provides. For EU and international tax law, Highlights and Insights on European Taxation and the Kluwer International Tax Law blog provide the most comprehensive coverage of EU Court of Justice developments and EU legislative progress. Tax Policy Associates publishes its analyses free and without advertising, making it one of the best-value resources in the UK tax landscape.

Use what you read to inform your conversations with your own advisors. The thought leaders on this list are not your advisors. But understanding their frameworks and the risks they are tracking should equip you to ask more productive questions of the professionals who are responsible for your specific situation.

For leadership teams in financial services, professional services, and tax-adjacent organisations who want to build the internal frameworks that allow them to translate external thought leadership into concrete decisions and actions, Jonno White works with executive teams as a facilitator and coach. International travel is often far more affordable than clients expect, and virtual facilitation is available globally. Reach out at jonno@consultclarity.org.

Frequently Asked Questions

What is the most important issue in UK tax strategy in 2026?

The UK tax landscape in 2026 is shaped by three converging pressures: the implementation of Pillar Two, which requires UK-headquartered multinationals to pay a minimum 15 percent effective tax rate globally; the ongoing reform of non-domicile taxation and the planning implications for internationally mobile high net worth individuals; and the structural reform of HMRC, which the IFS's April 2026 programme identified as the most urgent institutional challenge facing the UK tax system. For the corporate tax community, Pillar Two compliance dominates. For private client practitioners, non-dom reform and inheritance tax remain the most active planning issues.

Who are the best tax thought leaders to follow in Europe?

The answer depends on your specific focus. For the EU institutional and policy architecture, Pascal Saint-Amans at Bruegel and Irma Mosquera Valderrama at Leiden are the most connected and analytically rigorous voices. For the European wealth tax and inequality debate, Gabriel Zucman at the International Tax Observatory, Thomas Piketty at PSE, and Annette Alstadsaeter at the Norwegian University of Life Sciences provide the most empirically grounded analysis. For German tax policy, Christoph Spengel at Mannheim and Christoph Trautvetter at Netzwerk Steuergerechtigkeit cover the academic and advocacy dimensions respectively. For EU corporate tax law, Dennis Weber at Amsterdam and Patricia Lampreave at IE Law School are the most practically relevant academic voices.

What is Pillar Two and why does it matter for European businesses?

Pillar Two is the OECD's global minimum tax framework, requiring multinational enterprises with annual revenues above 750 million euros to pay a minimum effective tax rate of 15 percent regardless of where profits are booked. It came into force across EU member states through the EU Minimum Tax Directive and in the UK through the Finance Act. For European multinationals, it changes how corporate structures are evaluated, how effective tax rates are calculated across jurisdictions, and how transfer pricing arrangements are designed. The voices best placed to explain its implications are Pascal Saint-Amans, who was the lead OECD architect of the framework, and Christoph Spengel, whose research has modelled the compliance costs and effective rate implications for EU-headquartered groups.

Can someone facilitate tax leadership workshops or executive offsites for my team?

Jonno White is a Certified Working Genius Facilitator and author of Step Up or Step Out (10,000+ copies sold), who works with leadership teams in professional services, financial services, and corporate environments to build the communication, accountability, and alignment frameworks that allow organisations to translate external thinking into internal action. He does not provide tax advice, but his executive offsite and workshop facilitation helps leadership teams, including those in tax functions, advisory firms, and finance departments, make better decisions together and communicate more effectively about complex challenges. To discuss how Jonno might support your team, email jonno@consultclarity.org. Many organisations find that international travel is far more affordable than expected, and virtual facilitation is available globally.

Final Thoughts

The UK and European tax landscape is being reshaped by a combination of international reform, national political pressures, and technological change that has no direct precedent in recent decades. Pillar Two has changed the fundamental economics of corporate tax planning. The wealth tax debate has moved from academic proposition to legislative agenda across multiple European countries. HMRC's digital transformation is changing the compliance and enforcement relationship between the tax authority and UK businesses. The EU's VAT in the Digital Age package is about to transform how e-invoicing and real-time reporting work across the single market.

Navigating this environment requires access to the best thinking available, and the people on this list are producing that thinking in public. Whether you are a CFO, a private client advisor, a policy professional, or simply a well-informed citizen who wants to understand how the tax system works and where it is heading, following these voices consistently is one of the highest-leverage intellectual habits available to you. The field moves fast, but the fundamental questions, about fairness, efficiency, accountability, and democratic legitimacy, remain remarkably stable, and the people on this list are your best guides to both.

For leadership teams across professional services, financial services, and corporate organisations who want to build the internal culture and communication frameworks that allow them to genuinely engage with and act on the thinking this list represents, Jonno White, Certified Working Genius Facilitator and author of Step Up or Step Out (available at amazon.com.au/Step-Up-Out), provides executive offsites, workshops, and coaching that help teams make better decisions together. Email jonno@consultclarity.org to start a conversation. International travel is often far more affordable than clients expect.

About the Author

Jonno White is a Certified Working Genius Facilitator, author of Step Up or Step Out, and leadership consultant who has worked with schools, corporates, and nonprofits around the world. His book Step Up or Step Out has sold over 10,000 copies globally, and his podcast The Leadership Conversations has featured 230+ episodes reaching listeners in 150+ countries. Jonno founded The 7 Questions Movement with 6,000+ participating leaders and achieved a 93.75% satisfaction rating for his Working Genius masterclass at the ASBA 2025 National Conference. Based in Brisbane, Australia, Jonno works globally and regularly travels for speaking and facilitation engagements. Organisations consistently find that international travel is far more affordable than expected.

To book Jonno for your next keynote, workshop, or facilitation session, email jonno@consultclarity.org.

Sources

EU Tax Observatory (2023 Global Tax Evasion Report). EY (2025 Tax Risk and Controversy Survey). OECD (2021 GloBE Model Rules, updated 2022-2026). Tax Foundation Europe (2025 European Tax Policy Scorecard). Tax Justice Network (2023 Financial Secrecy Index). IFS (2025 Annual Report on HMRC reform).

Next Read: 50 Essential Global Thought Leaders on Tax Strategy

The UK and European tax landscape does not exist in isolation. The frameworks being contested in Brussels and London were designed in Geneva and Paris, implemented in more than 140 jurisdictions simultaneously, and challenged by academic research that circulates globally before it reaches any single national debate.

For more on thought leaders on tax strategy around the world, check out my blog post '50 Essential Global Thought Leaders on Tax Strategy' at consultclarity.org/post/global-thought-leaders-tax-strategy.