50 Essential Thought Leaders Globally on Loneliness

Introduction

Loneliness is not what most people think it is. Most of us picture it as a feeling that happens to the elderly, the isolated, the withdrawn. We associate it with empty rooms and silent phones. We assume it is a personal failure, a symptom of poor social skills, a sign that someone has somehow not managed their relationships correctly. We are wrong on almost every count.

Loneliness is a biological alarm signal, as ancient and as purposeful as hunger. It evolved in humans for the same reason hunger did: to force action. When our ancestors drifted from their group, loneliness triggered a stress response that pushed them back toward the safety of community. The problem in the twenty-first century is that this ancient system is being overwhelmed. The alarm is ringing constantly, in bodies that live digitally connected but socially disconnected lives, and the stress response it triggers is slowly, quietly destroying our health.

The World Health Organization declared loneliness a global public health priority in 2025, concluding that social isolation is associated with more than 871,000 preventable deaths annually. Research by Julianne Holt-Lunstad and colleagues at Brigham Young University established that the mortality risk associated with loneliness is equivalent to smoking up to fifteen cigarettes per day. A 2025 OECD report found that approximately six percent of adults across twenty-five member countries feel lonely most or all of the time. In the United States, former Surgeon General Vivek Murthy declared a national epidemic of loneliness and isolation in 2023, citing research showing that half of American adults were experiencing measurable loneliness before the COVID-19 pandemic had even begun.

This is not a personal problem. It is a structural one. And the thinkers, researchers, advocates, and practitioners working to understand and address it represent one of the most important intellectual communities in the world right now.

This list brings together fifty of the most significant voices working on loneliness globally. They span neuroscience, public health, psychology, policy, community design, technology, and the lived experience of social connection. Some have written the foundational research that governments cite in their national strategies. Others are building new frameworks for thinking about social health as its own dimension of wellbeing. Others still are doing the practical, ground-level work of helping people find each other again. Together, they represent the most important conversation of our time.

Jonno White is a Brisbane-based leadership consultant and bestselling author of Step Up or Step Out, who has worked with leadership teams in organisations that are grappling with the human costs of disconnection at work. To bring Jonno in to run a workshop on team culture and connection, email jonno@consultclarity.org.

Why Loneliness Matters: The Stakes

The reason it took so long for loneliness to be treated as a public health issue is partly definitional and partly cultural. Loneliness is subjective. It is the gap between the social connections you have and the social connections you want, which means it can exist even in a crowd, even in a marriage, even in a packed office. It does not show up on a blood test. It does not have a diagnostic code in most medical systems. And in cultures that valorise self-reliance and independence, admitting to loneliness carries the heavy weight of social stigma.

But the consequences are not subtle. Chronic loneliness is associated with a 29 percent higher risk of heart disease, a 32 percent higher risk of stroke, a 40 percent increased risk of developing dementia, and a 26 percent increased risk of premature death. It disrupts sleep, elevates cortisol, weakens immune function, and accelerates biological ageing at the cellular level. It is, according to the best available evidence, one of the single most dangerous conditions affecting human beings in high-income countries today.

The people on this list are not just interesting thinkers. They are the architects of the evidence base, the policy frameworks, and the practical solutions that will determine whether the next generation grows up in a world that has learned how to connect again. If you lead a team, design communities, build technology, set health policy, run schools, or simply care about what it means to live a good life, following these voices is not optional. It is essential.

Jonno White facilitates workshops for leadership teams working to address the hidden cost of workplace disconnection. Many organisations find that flying Jonno in costs less than engaging local providers. Email jonno@consultclarity.org.

How This List Was Compiled

The fifty voices here were selected on the basis of genuine, verifiable contribution to how we understand, measure, research, or respond to loneliness and social disconnection. The selection process applied deliberate geographic and disciplinary diversity targets, ensuring representation across North America, Europe, Asia-Pacific, Africa, and the Middle East. It includes neuroscientists and community advocates, public health architects and friendship practitioners, policy makers and journalists. The goal was not to reproduce the same household names that appear on every leadership-adjacent list, but to surface voices that the reader may not yet know, alongside those whose foundational contributions demand inclusion.

The list deliberately sought voices from the five-thousand to one-hundred-thousand follower band on professional platforms, because these are the practitioners and researchers who are most actively sharing their work, engaging with others, and building the knowledge base in real time. The curation standard was simple: genuine contribution to the field, recent and active engagement with the ideas, and the kind of specific work that a reader could follow up on directly.

Category 1: The Scientists Who Proved Loneliness Kills

This group of researchers produced the studies that turned loneliness from a social concern into a public health emergency. Their work, spanning neuroscience, epidemiology, and psychology, established the biological mechanisms of loneliness, quantified its mortality risk, and gave policymakers the evidence base they needed to act. Without this group, loneliness would still be seen as a personal problem rather than a structural crisis.

1. Julianne Holt-Lunstad | Brigham Young University

Julianne Holt-Lunstad is a professor of psychology and neuroscience at Brigham Young University and the founding scientific chair of the Foundation for Social Connection, whose 2015 meta-analytic review of over 300,000 participants established with extraordinary clarity that weak social relationships increase the risk of premature death by approximately 50 percent. That single finding, comparing loneliness to smoking fifteen cigarettes a day, became the statistic that governments cited when finally committing to national loneliness strategies. Holt-Lunstad served as lead scientific editor for the US Surgeon General's Advisory and National Strategy on Social Connection, and in 2026 she continues to chair the Social Connection in America longitudinal study, tracking national trends in connection over a twenty-five-year period.

Her work sits at the intersection of rigorous science and urgent advocacy, translating decades of laboratory research into the policy language that changes budgets and priorities. She is one of the most-cited researchers in the world on this topic.

2. Stephanie Cacioppo | University of Chicago

Stephanie Cacioppo is an Assistant Professor of Psychiatry and Behavioral Neuroscience at the University of Chicago Pritzker School of Medicine and the director of the Brain Dynamics Laboratory, where she has spent more than two decades mapping the neurological architecture of loneliness. Building on the foundational work she developed alongside John T. Cacioppo, she has identified the specific brain signatures that distinguish lonely from non-lonely individuals, including hypervigilance for social threat and the neural patterns that make loneliness self-reinforcing rather than self-correcting.

Her 2022 book Wired for Love synthesises this body of work for a general audience, arguing that human beings are neurologically designed for deep connection and that understanding this can help individuals and clinicians intervene more effectively at both personal and societal levels.

3. Louise Hawkley | NORC at the University of Chicago

Louise Hawkley is a senior research scientist at NORC at the University of Chicago and one of the world's leading authorities on the longitudinal study of loneliness in adults. Her collaborative research with John T. Cacioppo produced some of the most-cited studies on how loneliness changes over time, how it predicts physiological outcomes including blood pressure, sleep quality, and immune function, and how it interacts with ageing, cognitive decline, and mortality risk.

Hawkley is particularly known for the Chicago Health, Ageing, and Social Relations Study, a landmark longitudinal project that tracked hundreds of participants across years to understand how the experience of loneliness changes physiology. Her ongoing contributions to measurement science, including work on the validity of loneliness scales across cultures and populations, remain foundational for researchers globally.

4. Pamela Qualter | University of Manchester

Pamela Qualter is a Professor of Psychology for Education at the University of Manchester who led the BBC Loneliness Experiment, the world's largest survey of loneliness, and served as co-chair of the WHO Commission on Social Connection's Technical Advisory Group. Her research on loneliness trajectories in children and teenagers, tracking which young people experience transient versus chronic loneliness and why, has directly influenced school-based wellbeing programmes across the United Kingdom.

Qualter's work has been particularly influential in understanding why early interventions in school settings can interrupt what might otherwise become lifelong patterns of social withdrawal. Her publications in 2025 and 2026 continue to advance understanding of how loneliness in young adults clusters and progresses over time.

5. Michelle Lim | University of Sydney / Ending Loneliness Together

Michelle Lim is an Associate Professor and Principal Research Fellow at the University of Sydney's Sydney School of Public Health and the CEO and Scientific Chair of Ending Loneliness Together, Australia's national peak body on loneliness. Her clinical psychology research focuses on the effectiveness of interventions for loneliness, the development of measurement tools that are appropriate for diverse populations, and the translation of evidence into scalable community programmes.

Lim was the chief investigator of the Australian Loneliness Report (2018), the Young Australian Loneliness Survey (2019), and the State of the Nation Social Connection report (2023). In 2024, she was appointed as one of twenty global experts to advise the World Health Organization Commission on Social Connection Technical Advisory Group.

6. Ethan Kross | University of Michigan

Ethan Kross is a professor of psychology and management at the University of Michigan and the director of the Emotion and Self Control Laboratory, whose 2025 research published in Nature Communications challenged one of the loneliness field's most confident assumptions. His team found that people's beliefs about being alone, not simply the amount of time they spent alone, were the primary driver of whether solitude produced loneliness or contentment, with the effect holding across nine countries on six continents.

This finding has significant implications for public health campaigns that may inadvertently worsen loneliness by framing all solitude as harmful. Kross is also the author of Chatter: The Voice in Our Head and Why It Matters, which explores how self-talk shapes our capacity for connection and emotional regulation.

7. Gillian Sandstrom | University of Sussex

Gillian Sandstrom is a professor of the psychology of kindness at the University of Sussex whose research on brief social interactions, what she calls minimal social contact, has produced some of the most practically useful findings in the field. Her studies demonstrate that conversations with strangers and acquaintances, the brief exchange with a barista or the nod to a neighbour, contribute meaningfully to daily wellbeing in ways that most people dramatically underestimate.

Her work provides a research foundation for community-level interventions designed around casual contact rather than formal socialisation, which is particularly relevant for the design of urban spaces, public transport, and workplace layouts. Sandstrom's willingness to explore the relationship between small moments of human contact and large-scale wellbeing outcomes makes her one of the most innovative researchers in the field.

Category 2: The Public Health Architects

These are the people who took the science and made it a policy agenda. They built the commissions, wrote the advisories, founded the organisations, and persuaded governments to treat loneliness as a public health priority rather than a personal failing. Their work has changed the language that ministers and health officials use, and in several countries, it has changed budgets.

8. Vivek Murthy | Former US Surgeon General

Vivek Murthy served as the 19th and 21st Surgeon General of the United States and is widely credited with elevating loneliness from a marginal concern to a national emergency. His 2023 advisory Our Epidemic of Loneliness and Isolation laid out the evidence base, the scale of the problem, and a national framework for rebuilding social connection in America, covering everything from school design to urban planning to workplace culture.

His book Together: The Healing Power of Human Connection in a Sometimes Lonely World brought the science of loneliness to a mainstream audience. In 2025, Murthy co-chaired the WHO Commission on Social Connection alongside Chido Mpemba, producing a landmark global report on the state of social isolation and the actions required at every level of society.

9. Chido Mpemba | African Union

Chido Mpemba serves as Special Adviser on Youth and Women to the Chairperson of the African Union and co-chaired the WHO Commission on Social Connection, making her one of the most globally prominent voices on loneliness from the African continent and the Global South more broadly. Her contribution to the Commission was to insist that the narrative on loneliness be broadened beyond the high-income country framing that dominates most Western research.

Mpemba ensured that the 2025 Commission report addressed the specific drivers of social isolation in low- and middle-income contexts, including economic insecurity, forced migration, and the breakdown of community structures under rapid urbanisation. Her perspective that social connection is as much an economic and development priority as a health one has reshaped how the Commission's findings are being received in policy circles across Africa, Asia, and Latin America.

10. Kasley Killam | Social Health Labs

Kasley Killam is a Harvard-trained social scientist, author of The Art and Science of Connection, and founder of Social Health Labs, whose campaign to establish social health as a recognised dimension of overall wellbeing alongside physical and mental health has gained significant institutional traction over the past five years. Named one of the 100 Women to Know in America in 2025 and selected as the SXSW 2025 opening keynote speaker, Killam has developed the 5-3-1 framework for building and maintaining social health.

Her book synthesises more than a decade of research into a readable and actionable guide that bridges clinical evidence and daily practice. She has applied her frameworks across partnerships with the US Department of Health and Human Services, the Aspen Institute, AARP, and Google.

11. Kim Samuel | Samuel Family Foundation

Kim Samuel is an author, social entrepreneur, and the founder of the Samuel Centre for Social Connectedness at the University of Toronto, whose work has been instrumental in establishing social connectedness as a dimension of sustainable development and human rights, not merely a health issue. Her book On Belonging: Finding Connection in an Age of Isolation brought together research from anthropology, developmental psychology, neuroscience, and international development to argue that belonging is a fundamental human need that societies have an obligation to nurture.

Samuel has worked with the United Nations, the WHO, and the World Bank on integrating social connection into development frameworks, and her Centre produces applied research on belonging in contexts ranging from Indigenous communities to refugee settlement to urban design.

12. Bogdan Chiva Giurca | NASP UK

Bogdan Chiva Giurca is a medical doctor and researcher who serves as a global expert on social prescribing, a healthcare approach that connects patients to community activities, social support networks, and non-medical interventions to address the social determinants of health including loneliness. His work at the National Association for Social Prescribing in the United Kingdom has made him one of the most active international voices on how primary care systems can systematically address loneliness rather than simply treating its downstream consequences.

Chiva Giurca has presented at Campaign to End Loneliness international conferences and has written extensively on how social prescribing models that have been effective in the UK and Japan can be adapted for healthcare systems in other countries.

13. Andrew MacPherson | Foundation for Social Connection Action Network

Andrew MacPherson is the founder and executive chair of the Foundation for Social Connection Action Network (formerly the Coalition to End Social Isolation and Loneliness), the leading US advocacy organisation working to translate loneliness research into federal policy. MacPherson has testified before the US Senate, led the organisation's engagement with Congress on bipartisan legislation to measure and address loneliness at scale, and built a coalition of healthcare organisations, researchers, technology companies, and community groups united behind a common policy agenda.

Under his leadership, the Foundation convened the annual Global Loneliness Awareness Summit in Washington and produced impact reports tracking policy progress year by year.

14. Richard Weissbourd | Harvard Graduate School of Education

Richard Weissbourd is a developmental psychologist and faculty director of the Making Caring Common project at the Harvard Graduate School of Education, whose 2023 national survey on the causes of loneliness in America produced findings that challenged several widely held assumptions. His research found that loneliness among young people is driven significantly by a lack of purposeful engagement and meaningful contribution, not simply by social contact.

Weissbourd is the lead author of the report Loneliness in America: How the Pandemic Has Deepened an Epidemic of Loneliness and What We Can Do About It, which has been widely cited by educators, counsellors, and policymakers working on youth social isolation. His work on what makes relationships meaningful, rather than merely numerous, has reshaped how many practitioners design youth programmes.

Category 3: The Neuroscience and Psychology Researchers

This group examines the mechanisms of loneliness at the individual level: how it is experienced in the brain, how it shapes behaviour, how digital technology is rewiring our capacity for connection, and how new interventions can interrupt the cognitive patterns that make loneliness self-reinforcing.

15. Robert Waldinger | Harvard Medical School

Robert Waldinger is a professor of psychiatry at Harvard Medical School and the director of the Harvard Study of Adult Development, the world's longest scientific study of happiness and adult life, now spanning over eighty years and three generations of participants. His TED Talk has been viewed more than 40 million times, making it one of the ten most-watched TED talks ever, and distilled the central conclusion of eight decades of longitudinal research into a single insight: the quality of our relationships is the strongest predictor of health, happiness, and longevity.

His 2023 book The Good Life: Lessons from the World's Longest Scientific Study of Happiness, co-authored with Marc Schulz, translates those findings into practical guidance for people at every stage of life. Waldinger is among the most compelling public voices on why relationships are not peripheral to wellbeing but its foundation.

16. Marc Schulz | Bryn Mawr College

Marc Schulz is the associate director of the Harvard Study of Adult Development and the Sue Kardas PhD 1971 Chair in Psychology at Bryn Mawr College, who co-authored The Good Life with Robert Waldinger and has been a key contributor to the study's longitudinal research design and analysis. His particular focus is on how close relationships function differently across the lifespan, and how the patterns of emotional regulation and social engagement established in childhood and early adulthood shape the quality of relationships in midlife and old age.

Schulz brings a developmental psychology lens to the loneliness conversation that is often missing in work focused exclusively on interventions for adults, making his research foundational for understanding how and when the relational patterns that predict loneliness are formed.

17. Matthew Lieberman | UCLA

Matthew Lieberman is a professor of psychology and neuroscience at UCLA and the author of Social: Why Our Brains Are Wired to Connect, whose research on the social brain has helped establish why human beings are so fundamentally dependent on social connection at a neurological level. His work on the default network, the brain system that activates during rest and is primarily oriented toward thinking about other people, demonstrates that social cognition is the brain's default state, not a specialised function.

This finding has profound implications for understanding why isolation is so damaging: it literally deprives the brain of its preferred mode of operation. Lieberman's research has been cited in numerous national loneliness strategies and has influenced how public health campaigns frame the case for treating loneliness as a biological and not merely emotional concern.

18. Jean Twenge | San Diego State University

Jean Twenge is a professor of psychology at San Diego State University and the author of iGen and Generations, whose analysis of generational data on mental health, loneliness, and social behaviour identified the sharp upturn in teen loneliness, depression, and social isolation that began in 2012, correlating closely with the widespread adoption of smartphones and social media among adolescents.

Her research sparked a global debate about the role of digital technology in driving youth loneliness and contributed directly to policy conversations about social media regulation, phone-free schools, and minimum age requirements for social media platforms. Twenge's willingness to follow the data to uncomfortable conclusions, even when they challenge popular narratives about digital connection, has made her one of the most influential and discussed figures in the field.

19. Jamil Zaki | Stanford University

Jamil Zaki is a professor of psychology at Stanford University and director of the Stanford Social Neuroscience Lab, whose research on empathy and compassion provides one of the most important counterweights to the growing body of work focused on loneliness's damage. His book The War for Kindness: Building Empathy in a Fractured World argues that empathy is not fixed but trainable, and that deliberate efforts to cultivate compassion can rebuild the social fabric that loneliness erodes.

Zaki's research demonstrates that organisations, communities, and individuals who invest in developing empathy as a skill experience measurably stronger social connections and lower rates of loneliness-related burnout. His work bridges the gap between the neuroscience of social connection and the practical question of how to build more connected organisations and communities.

20. Amy Orben | University of Cambridge

Amy Orben is a research leader at the MRC Cognition and Brain Sciences Unit at the University of Cambridge, whose rigorous statistical analyses of large population datasets have helped bring greater nuance to the debate about social media and loneliness. Her co-authored research with Andrew Przybylski established that the relationship between screen time and adolescent wellbeing, while real, is considerably smaller in effect size than the popular narrative suggests.

This finding does not dismiss the concern but recalibrates it, and it has been widely cited by researchers arguing that moral panics about digital technology can distract from the structural factors that drive loneliness at scale. Orben's commitment to methodological rigour in a field prone to dramatic claims makes her work indispensable for anyone trying to understand what the evidence actually shows.

21. William Chopik | Michigan State University

William Chopik is an associate professor of psychology at Michigan State University whose research on friendship across the lifespan has produced findings that challenge assumptions about when and how friendships matter most for health. His studies demonstrate that the quality of friendships, specifically whether people feel truly understood and accepted by their friends, is a stronger predictor of health and wellbeing in older age than the quality of family relationships.

This finding has direct implications for how elder care, retirement communities, and aging services should be designed. Chopik is also known for cross-national research examining how friendship patterns vary across cultures and how those differences interact with national rates of loneliness, giving his work a global perspective that is often missing from studies focused on single countries.

Category 4: The Social Policy Pioneers

This group has brought loneliness into the policy arena, written the books that framed the public conversation, and built the evidence base that national governments draw on when designing their loneliness strategies. They work at the intersection of social science, politics, and public affairs.

22. Noreena Hertz | University College London

Noreena Hertz is an Honorary Professor at University College London's Institute for Global Prosperity, an economist, broadcaster, and author of The Lonely Century: How to Restore Human Connection in a World That's Pulling Apart, one of the most comprehensive examinations of how economic, political, and social systems have been structured to produce loneliness at scale. Named by The Observer as one of the world's leading thinkers and by Vogue as one of the world's most inspiring women, Hertz argues that neoliberal economic policy since the 1980s has systematically dismantled the community institutions, physical spaces, and civic structures that historically provided social connection.

Her central argument, that reversing the loneliness epidemic requires redesigning those systems rather than merely helping individuals manage their feelings better, has brought a structural political economy lens to a conversation that is often dominated by individual psychology. Her TEDx talks and media appearances have brought this argument to a mass audience.

23. Robert Putnam | Harvard Kennedy School

Robert Putnam is a professor emeritus of public policy at Harvard Kennedy School and the author of Bowling Alone: The Collapse and Revival of American Community, arguably the most influential social science book of the past quarter century in terms of its impact on public conversation about loneliness, social capital, and civic disconnection. Published in 2000 and still widely cited twenty-five years later, Bowling Alone documented the dramatic decline in American associational life, from bowling leagues to parent-teacher organisations to neighbourhood gatherings.

His later work Upswing traced long-term cycles of social cohesion and fragmentation in American life, providing historical context for the current loneliness crisis. Putnam's framing of social capital as a measurable, structural resource that communities can build or deplete has become foundational for how policymakers across the political spectrum think about community and belonging.

24. Lisa Berkman | Harvard T.H. Chan School of Public Health

Lisa Berkman is a professor of public health and epidemiology at the Harvard T.H. Chan School of Public Health and one of the founding figures of the social determinants of health movement, whose 1979 paper with Leonard Syme on social networks and all-cause mortality established, for the first time in a large population study, that social ties are as important to survival as diet, exercise, and smoking. That paper is now among the most cited in the history of epidemiology.

Berkman has continued to lead major longitudinal studies on social integration and health across the lifespan, and her work on social engagement as distinct from mere social contact has sharpened understanding of which kinds of relationships actually protect health. Her framing has directly influenced how international health organisations measure and report on social connection.

25. David Brooks | New York Times / Weave Project

David Brooks is a New York Times columnist and the founder of Weave: The Social Fabric Project at the Aspen Institute, whose work over the past decade has shifted from political commentary to what he calls the social crisis underlying American political dysfunction. His book The Second Mountain: The Quest for a Moral Life argued that the individualism embedded in American culture has produced a profound crisis of meaning and connection, and that rebuilding community is the defining moral task of the current era.

Through Weave, Brooks has compiled a network of thousands of community weavers across the United States, people building connection in their local environments, and has used that network to document how grassroots social connection is being rebuilt after decades of institutional decline.

26. Vanessa Burholt | University of Auckland

Vanessa Burholt is a professor of gerontology at the University of Auckland and a leading international researcher on loneliness in older adults across diverse cultural contexts. She was a signatory of the 2020 Lancet letter calling for a unified global approach to loneliness research and has contributed to major cross-national studies examining how cultural attitudes toward family obligation, intergenerational living, and community care mediate the experience of loneliness in ageing populations.

Her work on cultural loneliness, the specific form of isolation experienced by people who live in cultural environments misaligned with their own background, has opened new lines of research on migration, ethnic minority communities, and the experience of loneliness among older adults who are culturally as well as socially isolated.

27. Mathias Lasgaard | University of Southern Denmark

Mathias Lasgaard is a professor and senior researcher at the University of Southern Denmark and one of Europe's most prominent voices on the assessment and treatment of loneliness across the lifespan. He is a key figure in Denmark's national loneliness strategy and has contributed to research shaping the social connection policies of multiple Scandinavian countries.

His work on loneliness in adolescence and young adulthood identified patterns of social withdrawal and peer rejection in Danish youth that closely mirror patterns found in British and American data, challenging the assumption that more communal Nordic cultures are somehow protected from the loneliness epidemic. Lasgaard's presentations at international conferences have made him one of the most visible European researchers in the field.

28. Nicole Valtorta | Newcastle University

Nicole Valtorta is a senior researcher in population health at Newcastle University whose 2016 systematic review and meta-analysis established for the first time the specific causal relationship between loneliness and coronary heart disease and stroke, demonstrating a 29 percent increased risk of heart disease and 32 percent increased risk of stroke in lonely individuals.

That study was foundational for the UK government's decision to appoint the world's first Minister for Loneliness in 2018, and it remains one of the most-cited references in any policy document on loneliness and social isolation. Valtorta continues to research the cardiovascular and neurological mechanisms linking social isolation to disease outcomes, contributing to a growing body of evidence that loneliness should be treated as a modifiable cardiovascular risk factor.

Category 5: The Friendship and Connection Practitioners

This group focuses on the practical experience of loneliness and connection: how people make friends in adulthood, why belonging feels so difficult in modern life, and what individuals can do to build richer social lives. They bridge research and practice, making the science of connection accessible to people who are experiencing its absence.

29. Marisa Franco | University of Maryland

Marisa Franco is a psychologist, professor at the University of Maryland, and the New York Times bestselling author of Platonic: How the Science of Attachment Can Help You Make and Keep Friends, whose work has made the psychology of adult friendship accessible to millions of readers who recognise themselves in the book's central observation: that making friends in adulthood is bewilderingly hard, and that nobody teaches us how to do it.

Franco's research draws on attachment theory, evolutionary psychology, and social neuroscience to explain why loneliness in adulthood is so common and what individuals can do to build the deep friendships that protect health and wellbeing. She writes for Psychology Today and has been featured in the New York Times, NPR, and Good Morning America.

30. Kat Vellos | We Should Get Together

Kat Vellos is a connection coach, author of We Should Get Together: The Secret to Cultivating Better Friendships, and founder of the We Should Get Together community, whose work focuses specifically on the experience of adult friendship drought, the gap between the rich social connections most adults remember from earlier in life and the sparse, often transactional relationships that define adult social life in cities.

Her book, drawn from interviews with hundreds of people about their friendship experiences, identified the structural barriers that prevent adults from building the kinds of friendships they want, including time scarcity, geographic instability, and cultural norms that deprioritise platonic friendship relative to romantic and family relationships. Vellos regularly facilitates workshops and events designed to create the conditions for genuine adult friendship to form.

31. Adam Smiley Poswolsky | Workplace Belonging

Adam Smiley Poswolsky is an internationally recognised keynote speaker and the author of Friendship in the Age of Loneliness, who works with organisations including Apple, Google, Verizon, and JPMorgan Chase on building cultures of belonging that reduce workplace loneliness and increase team engagement. His TED talk has been viewed more than two million times, and he has delivered over 600 keynotes in twenty-five countries.

Poswolsky's particular contribution is connecting the individual experience of loneliness to the design of organisational culture, arguing that employers are not bystanders in the loneliness epidemic but active participants who can make it significantly better or worse through the choices they make about how work is structured, where it happens, and how relationships are supported.

32. Simone Heng | Author and Speaker

Simone Heng is a Singapore-based author and keynote speaker whose book Let's Talk About Loneliness drew on her experience as a broadcaster in the United Arab Emirates and Singapore to examine how migration, social media, and the pressure to project success compound loneliness across cultures. Heng's contribution to the field is her focus on the global experience of loneliness in high-performing, outwardly successful people, a population that rarely appears in clinical research samples but whose loneliness is real and whose silence about it particularly damaging.

Her work has been widely shared across the Asia-Pacific region and the Middle East, bringing voices and perspectives to the loneliness conversation that are underrepresented in the predominantly Western academic literature.

33. Allison Gilbert | Journalist and Author

Allison Gilbert is an Emmy Award-winning journalist and co-author of The Joy of Connections: 100 Ways to Beat Loneliness and Live a Happier and More Meaningful Life, co-written with the late Dr. Ruth Westheimer and Pierre Lehu. The book was Dr. Ruth's final work before her death in 2024. Gilbert hosts the Making Connections series with Reimagine, a monthly conversation series on overcoming social isolation.

Her journalism for the New York Times on Dr. Ruth's appointment as New York State's first Ambassador to Loneliness helped elevate public awareness of how loneliness is being treated as a policy priority at state level in the United States. Gilbert consistently brings emotional intelligence and human storytelling to what can otherwise become a dry public health narrative.

34. Arthur Brooks | Harvard Kennedy School

Arthur Brooks is a professor at the Harvard Kennedy School and Harvard Business School and the author of From Strength to Strength: Finding Success, Happiness, and Deep Purpose in the Second Half of Life, whose research on the relationship between social connection, meaning, and happiness has made him one of the most widely read commentators on the culture of disconnection in contemporary Western life.

His Atlantic column How to Build a Life regularly addresses loneliness, friendship, and the question of how modern people can rebuild the relationships that give life meaning. Brooks argues that the relentless pursuit of achievement and status actively undermines the social connections that produce genuine wellbeing, and that the loneliness epidemic is in part a consequence of cultural values that celebrate independence over interdependence.

35. Marta Zaraska | Journalist and Author

Marta Zaraska is a science journalist and author of Growing Young: How Friendship, Optimism and Kindness Can Help You Live to 100, whose synthesis of the research on social connection and longevity makes a compelling case that the conventional pillars of healthy ageing, diet and exercise, are less powerful predictors of lifespan than the quality of our social relationships.

Drawing on longitudinal studies, neuroscience, and evolutionary biology, Zaraska argues that kindness, community, and friendship have direct biological effects on ageing processes, reducing inflammation, strengthening immune function, and extending healthy lifespan. Her work has been featured in Scientific American, Aeon, the Washington Post, and on the BBC.

36. Priya Parker | Author and Facilitator

Priya Parker is the author of The Art of Gathering: How We Meet and Why It Matters and a strategic facilitator whose central argument is that most modern gatherings fail because they are designed for logistics, comfort, and efficiency rather than for transformation and belonging. She argues that the loneliness epidemic is in part a product of the fact that most of the spaces where people could connect are not designed to produce genuine connection.

Parker's facilitation practice has worked with the United Nations, Google, the Obama Foundation, and major corporations. Her framework for intentional gathering design has been widely adopted by community organisers, conference designers, and workplace culture leaders who want their events to genuinely build the relationships they claim to value.

Category 6: The Workplace and Leadership Voices

Loneliness does not stop when people arrive at work. Research consistently shows that significant proportions of employees, including senior leaders, experience profound loneliness in their professional lives. This group addresses the specific dynamics of workplace loneliness, executive isolation, and the role of organisations in either deepening or alleviating social disconnection.

37. Michael Lee Stallard | Connection Culture Group

Michael Lee Stallard is the co-founder of Connection Culture Group and the author of Connection Culture: The Competitive Advantage of Shared Identity, Empathy, and Understanding at Work, whose research on the human cost of workplace disconnection makes him one of the most cited voices on how leaders can build team cultures that actively reduce loneliness and increase engagement.

His Connection Culture framework, developed over more than a decade of working with organisations including Google, Abbott, the US Department of State, and the American Red Cross, identifies three dimensions of workplace connection, vision alignment, valued contributions, and genuine care between colleagues, and demonstrates that organisations with high connection culture significantly outperform their peers on measures of productivity, retention, and wellbeing.

38. Nick Jonsson | Evolve Systems Group

Nick Jonsson is the co-founder and managing director of Evolve Systems Group in Singapore and the author of Executive Loneliness: The 5 Pathways to Overcoming Isolation, Stress, Vulnerability and Burnout, whose book broke new ground by documenting the specific experience of loneliness among C-suite executives and senior leaders in Asia and globally.

Drawing on his own experience of profound isolation at the top of his career, Jonsson identified the structural reasons why executives become lonely, including the erosion of peer friendships as people move up organisational hierarchies, the cultural expectation that leaders must project strength and certainty at all times, and the transactional nature of most professional relationships at senior levels. His work is particularly significant for the Asia-Pacific context, where leadership loneliness is culturally underacknowledged.

39. Ryan Jenkins | Human Connection Speaker

Ryan Jenkins is a speaker and author who focuses on workplace belonging and the specific experience of loneliness among younger workers in hybrid and remote work environments. His research on Gen Z workplace disconnection has produced frameworks that human resources and people leadership teams can apply to reduce isolation in distributed work settings.

Jenkins addresses the specific ways that the loss of informal, incidental workplace contact, the hallway conversation, the team lunch, the spontaneous collaboration, drives loneliness among remote and hybrid workers who may have full meeting calendars but few genuine relationships. He brings a generational lens to workplace loneliness that is often missing from broader research on social isolation.

40. Morra Aarons-Mele | The Anxious Achiever

Morra Aarons-Mele is the host of The Anxious Achiever podcast and author of Hiding in the Bathroom and The Anxious Achiever: Turn Your Biggest Fears into Your Leadership Superpower, whose work on anxiety, ambition, and social performance in professional settings addresses one of the least-discussed drivers of workplace loneliness: the performance of wellness and confidence that prevents people from revealing the loneliness and disconnection they actually feel.

Her podcast, which has been recognised by the American Heart Association with its media award, reaches hundreds of thousands of professionals who recognise themselves in her description of high-achieving people who are technically surrounded by colleagues but fundamentally unknown by them.

41. Jessica Methot | Rutgers University

Jessica Methot is a professor of human resource management at Rutgers University whose research on workplace relationships examines both how they form and how their absence, expressed as loneliness among colleagues, affects performance, creativity, and retention. Her studies on energy networks in organisations, the informal relationships through which people draw vitality and engagement from work, demonstrate that the quality of low-intensity, incidental relationships at work matters considerably to individual wellbeing and team effectiveness.

This work provides an evidence base for why hybrid and remote work policies that eliminate informal contact can dramatically increase workplace loneliness without leaders recognising what is happening.

42. Jonathan Haidt | NYU Stern School of Business

Jonathan Haidt is a professor of ethical leadership at NYU Stern School of Business and the author of The Anxious Generation: How the Great Rewiring of Childhood Is Causing an Epidemic of Mental Illness, whose analysis of the smartphone and social media revolution's impact on adolescent mental health has made him one of the most influential voices in the global debate about digital technology and loneliness.

His research examines the sharp deterioration in youth mental health across high-income countries from approximately 2012, coinciding precisely with widespread smartphone adoption among adolescents. His policy recommendations including phone-free schools and minimum age requirements for social media platforms have been adopted in multiple countries.

43. Jeremy Nobel | Harvard Medical School

Jeremy Nobel is a public health faculty member at Harvard Medical School and the founder of the Foundation for Art and Healing, whose work on the relationship between creative expression and loneliness has established art-making, creative writing, and artistic engagement as evidence-based interventions for social isolation. His book Project UnLonely: Healing Our Crisis of Disconnection argues that creative expression uniquely addresses loneliness because it allows people to share an inner world that is difficult to articulate directly, creating connection through the recognition of shared experience.

Nobel's UnLonely Film Festival and Project UnLonely initiatives have brought creative connection approaches to healthcare settings, schools, and community organisations across the United States and internationally.

Category 7: The Community and Design Builders

This group works on the physical, clinical, and community-level conditions that either enable or prevent connection. They include geriatricians, urban health researchers, community builders, and practitioners who are designing the environments, programmes, and healthcare approaches that can systematically reduce loneliness at scale.

44. Thomas Cudjoe | Johns Hopkins

Thomas Cudjoe is an assistant professor of medicine at the Johns Hopkins School of Medicine whose geriatric research focuses on the intersection of physical frailty, cognitive decline, and social isolation in older adults, with particular attention to how racial and socioeconomic disparities shape loneliness among ageing populations. His co-authored 2023 state of the field review mapped the current evidence on loneliness research and identified the key gaps that must be addressed for the field to advance.

Cudjoe's clinical practice as a geriatrician gives his research a practical grounding that is rare in the loneliness field, and his focus on health disparities ensures that the populations most at risk of severe loneliness are represented in the research agenda.

45. Carla Perissinotto | UC San Francisco

Carla Perissinotto is a geriatrics professor at the University of California, San Francisco whose 2012 study in JAMA Internal Medicine was among the first to demonstrate, in a large community-based sample, that loneliness is an independent risk factor for physical decline in ageing, separate from and additional to the effects of depression and social isolation.

Her subsequent work on practical clinical approaches to assessing and mitigating loneliness in primary care settings has made her one of the most influential voices on how healthcare systems can systematically identify and address loneliness as a treatable condition rather than an inevitable feature of ageing. Perissinotto's clinical frameworks are now being adopted by health systems and primary care networks across the United States.

46. Kate Mulligan | University of Toronto

Kate Mulligan is a professor and researcher at the Dalla Lana School of Public Health at the University of Toronto and one of Canada's leading researchers on social prescribing and social connection as public health interventions. Her work on the implementation of social prescribing in the Canadian context, building on the UK's extensive experience with link workers and community referral systems, has contributed significantly to the growing movement to establish social prescribing as a standard component of primary care in North America.

Mulligan's research examines both the evidence for social prescribing's effectiveness in reducing loneliness and the structural and funding conditions necessary for it to be implemented equitably across diverse communities.

47. Anna Dixon | Centre for Ageing Better

Anna Dixon is the chief executive of the Centre for Ageing Better in the United Kingdom, a charitable foundation whose work focuses on improving the experience of later life, with social connection and loneliness among its central concerns. Her advocacy and research agenda has significantly influenced UK government policy on ageing, from the design of housing that enables connection to the development of age-inclusive employment practices that allow older workers to maintain meaningful professional relationships.

Dixon brings both a policy perspective and a practical one, leading an organisation that translates research into programme design, campaign advocacy, and governmental partnership. Her position makes her one of the most institutionally powerful voices on ageing and loneliness in the UK context.

48. Sebastian Junger | Journalist and Author

Sebastian Junger is an American journalist and documentary filmmaker whose 2016 book Tribe: On Homecoming and Belonging has become one of the most widely read explorations of why modern Western societies are structurally prone to loneliness, despite their material abundance. Drawing on anthropological research, evolutionary psychology, and his own experience embedded with soldiers in Afghanistan, Junger argues that human beings evolved for the intense, purpose-driven belonging of small, interdependent communities.

Tribe has been particularly influential among veterans' organisations, community builders, and people working on the specific loneliness of the transition from high-stakes collective environments to the atomised routines of modern civilian life. Its core insight, that prosperity and safety, by eliminating shared challenges, inadvertently destroy the conditions for belonging, has become one of the most cited arguments in the social connection literature.

49. Radha Modgil | NHS UK

Radha Modgil is a UK NHS GP, broadcaster, and lifestyle medicine practitioner who has become one of the most prominent medical voices on the health impacts of loneliness in the United Kingdom. She is a vice-president of the British Society of Lifestyle Medicine and regularly contributes to public health campaigns connecting loneliness, community participation, and chronic disease prevention.

Modgil presented at the Campaign to End Loneliness international conference and is an active voice on the intersection of social prescribing, mental health, and the role that GPs and primary care practitioners can play in identifying and responding to loneliness in their patient populations. Her communication of complex health research in accessible media formats has given her significant public reach.

50. Jonno White | Consult Clarity

The thinkers on this list are the researchers, advocates, and authors who have mapped the loneliness epidemic, proved its severity, and begun to design the responses. Jonno White is the person you bring in when you are ready to act on what they are saying inside your organisation. As a Certified Working Genius Facilitator and bestselling author of Step Up or Step Out, with over 10,000 copies sold globally, Jonno works with leadership teams who recognise that the culture in their organisation is more isolated than it needs to be, and who want to build the kind of psychological safety, honest communication, and genuine team cohesion that is the antidote to professional disconnection.

Host of The Leadership Conversations Podcast with 230 episodes and listeners in 150 countries, Jonno has facilitated hundreds of sessions with executive teams, school leadership groups, and corporate organisations across Australia and internationally. International travel is often far more affordable than clients expect. Email jonno@consultclarity.org to discuss what your team needs.

Notable Voices We Almost Included

A number of names that would appear on most lists like this one are absent here by editorial choice rather than by accident or oversight. Brene Brown, Adam Grant, and Simon Sinek have each made contributions to how we think about belonging and vulnerability that have shaped the broader conversation. Their work is foundational and their reach is extraordinary. The decision to move past them here was deliberate: the list is designed to surface voices the reader may not yet have encountered rather than to confirm what they already know.

Among the voices who were seriously considered but did not make the final list: Claude Fischer at UC Berkeley, whose rigorous sociological challenge to the epidemic narrative provides an important counterweight to the dominant framing; Olivia Remes at Cambridge, whose research on anxiety and loneliness interventions is highly active; Mitch Prinstein at UNC, whose work on popularity and adolescent belonging is closely related; and Neha Sangwan, whose clinical work on loneliness in healthcare settings is compelling. Each of these voices is worth following. Their absence from this list reflects only the constraints of a fifty-person format, not any assessment of the quality of their work.

Common Mistakes When Engaging With Loneliness Thought Leadership

The first and most common mistake is treating loneliness as a personal problem that requires individual solutions. The most important insight that the researchers and advocates on this list share is that loneliness is a structural problem, produced by economic policies, urban design, digital technology architecture, healthcare system design, and cultural values, and that interventions aimed purely at the individual cannot solve a problem created at the level of systems.

The second mistake is conflating loneliness with introversion, reclusiveness, or social anxiety. Loneliness is the gap between the social connections you want and the ones you have. It is entirely possible to be introverted, to prefer smaller social circles, and to spend significant time alone without being lonely. And it is equally possible to be extroverted, socially active, and surrounded by people while experiencing profound loneliness. The distinction matters enormously for how interventions are designed and targeted.

The third mistake is assuming that digital connection solves the problem. The work of Jean Twenge, Jonathan Haidt, Amy Orben, and others has produced a nuanced picture in which social media and digital communication can maintain existing relationships but rarely creates the depth of new ones, and in which passive social media consumption is associated with measurable increases in loneliness.

The fourth mistake is treating the voices on this list as interchangeable. The field of loneliness research is genuinely contested on several important questions, including how common loneliness really is, how much of the increase is attributable to technology versus structural economic changes, and which interventions work for which populations. Reading across multiple perspectives, including those that challenge each other, is how you develop a genuinely sophisticated understanding of the issue.

The fifth mistake is failing to bring the conversation into leadership and organisational contexts. The research on workplace loneliness is consistent: significant proportions of employees, including at senior levels, experience loneliness at work that undermines their performance, their creativity, and their willingness to stay. Leaders who treat this as someone else's problem are missing one of the most powerful levers available for improving team culture and organisational effectiveness.

Implementation Guide: Building Your Loneliness Literacy

The best starting point for anyone new to this field is Vivek Murthy's Our Epidemic of Loneliness and Isolation advisory, which is freely available online and provides the clearest single-document overview of the evidence, the scale of the problem, and the recommended directions for action. Read alongside the WHO Commission on Social Connection's 2025 report From Loneliness to Social Connection, which provides the global frame that the US advisory necessarily lacks.

For the neuroscience and biology of loneliness, Stephanie Cacioppo's Wired for Love and Robert Waldinger and Marc Schulz's The Good Life are the most accessible entry points. Both are written for general audiences and both will permanently change how you think about the relationship between social connection and health.

For the social and policy dimensions, Noreena Hertz's The Lonely Century and Robert Putnam's Bowling Alone are essential. They are separated by twenty years but read well together because Hertz explicitly builds on and updates Putnam's diagnosis for the digital age.

For practical application in your own life, Marisa Franco's Platonic and Kasley Killam's The Art and Science of Connection are the two most research-grounded and practically useful guides to building the social health that protects against loneliness.

For organisations and leadership teams, Michael Lee Stallard's Connection Culture and Nick Jonsson's Executive Loneliness address the workplace dimension that most general loneliness literature overlooks.

Follow the voices on this list on LinkedIn and subscribe to their newsletters where available. Engage with their posts thoughtfully when you have something genuine to add. The loneliness conversation is one that benefits from being had publicly as well as privately.

If you lead a team and want to address the hidden cost of disconnection in your organisation, Jonno White delivers workshops and offsites that build the communication frameworks and team culture that allow people to actually know each other at work. Email jonno@consultclarity.org.

Frequently Asked Questions

Who are the most important researchers on loneliness globally?

The foundational scientific contributors are Julianne Holt-Lunstad at Brigham Young University, whose meta-analyses established the mortality risk of loneliness; Stephanie Cacioppo at the University of Chicago, who has mapped the neurological architecture of loneliness; and Louise Hawkley, also at the University of Chicago, whose longitudinal studies tracked how loneliness changes physiology over time. On the public health policy side, Vivek Murthy and the WHO Commission on Social Connection co-chaired by Chido Mpemba have been most influential globally.

What is the difference between loneliness and social isolation?

Social isolation is an objective measure: the absence of social contact, few relationships, infrequent interaction. Loneliness is subjective: the distressing experience of perceived inadequacy in your social connections, where what you have does not match what you want. The two often overlap but they are not the same. Someone can be objectively isolated and not feel lonely, or surrounded by people and profoundly lonely. Most research now treats them as distinct constructs requiring different interventions.

How was this list compiled?

This list was compiled on the basis of verifiable, specific contribution to how we understand, measure, research, or respond to loneliness and social disconnection. Candidates were assessed across disciplines including neuroscience, psychology, public health, policy, community design, and practice. Geographic diversity was deliberately prioritised, with representation from North America, Europe, Asia-Pacific, Africa, and the Middle East. The selection standard was genuine impact on the field, whether through landmark research, policy influence, public advocacy, or practical application.

Is loneliness really getting worse, or does it just feel that way?

The evidence is genuinely mixed. The WHO Commission's 2025 report found that self-reported loneliness has increased significantly among young people and men in OECD countries since the COVID-19 pandemic, and that the trend among youth predates the pandemic, tracking with smartphone adoption from approximately 2012. However, some researchers, notably Claude Fischer at UC Berkeley, argue that the data on long-term trends is less clear-cut than the epidemic framing suggests. What is not contested is that certain populations, including young adults, men in midlife, and older adults living alone, are experiencing loneliness at rates that have significant health consequences.

Can I hire someone to run workshops on connection and team culture for my team?

Yes. Jonno White is a Brisbane-based leadership consultant, Certified Working Genius Facilitator, and bestselling author of Step Up or Step Out, who works with leadership teams on the culture, communication, and psychological safety dimensions of workplace connection. He delivers workshops, executive offsites, and keynotes globally. International travel is often more affordable than clients anticipate. Email jonno@consultclarity.org to discuss your team's needs.

What is social prescribing?

Social prescribing is a healthcare approach that connects patients to community activities, social support networks, and non-clinical interventions as a way of addressing the social determinants of health, including loneliness. Originating in the United Kingdom, social prescribing typically involves a link worker in a primary care setting who connects patients experiencing loneliness to community groups, volunteering opportunities, arts programmes, and other social infrastructure. The UK's National Health Service has integrated social prescribing into primary care at scale, and similar programmes are being developed in Japan, Canada, Australia, and the United States.

What is social health?

Social health is a concept developed and championed primarily by Kasley Killam, which frames the quality of our relationships and our sense of connection and belonging as a distinct dimension of overall health, alongside physical and mental health. Killam's book The Art and Science of Connection argues that social health is measurable, improvable, and neglected by both individuals and health systems in ways that make the loneliness epidemic significantly worse than it needs to be.

Final Thoughts

The fifty voices on this list are working on what may be the defining public health challenge of the twenty-first century. Not war, not climate change, not artificial intelligence, though each of those intersects with loneliness in ways that remain to be fully understood. The challenge of human connection in an age of digital distraction, economic atomisation, and institutional decline is the thread that runs through almost every other social problem we face, from political polarisation to the mental health crisis to the epidemic of disengagement at work.

The research is clear: people who are socially connected live longer, healthier, happier lives. They are more productive, more creative, more resilient, and more capable of navigating the difficulties that life inevitably brings. The question is not whether social connection matters. The question is what we, as individuals, as leaders, as communities, and as societies, are willing to do to protect and rebuild it.

Follow the voices on this list. Read their books. Engage with their research. And then do something with it, in your team, your community, your organisation, or your own life.

Jonno White is the author of Step Up or Step Out, with over 10,000 copies sold globally, and host of The Leadership Conversations Podcast with 230 episodes reaching listeners in more than 150 countries. As a Certified Working Genius Facilitator and leadership consultant, Jonno works with organisations that want to translate the ideas on this list into the actual team culture they experience on Monday mornings. Email jonno@consultclarity.org or visit consultclarity.org.

For more on building psychologically safe and connected team cultures, check out my blog post 15 Proven Ways to Overcome Loneliness at the Top at consultclarity.org/post/overcome-loneliness-at-the-top.

About the Author

Jonno White is a Certified Working Genius Facilitator, bestselling author, and leadership consultant who has worked with schools, corporates, and nonprofits across the UK, India, Australia, Canada, Mongolia, New Zealand, Romania, Singapore, South Africa, USA, Finland, Namibia, and more. 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.

Next Read: 15 Proven Ways to Overcome Loneliness at the Top

You sit in meetings where everyone defers to your opinion, attend events where every conversation feels transactional, and go home at the end of the day carrying questions that nobody around you is equipped to help you answer. The people who report to you see a leader in control. What they do not see is the weight of decisions made in silence, the filtered information that reaches your desk, and the growing distance between the role you play and the person you are.

Reading about leadership loneliness is not the same as doing something about it. Here is a practical 30-day implementation guide to help you move from awareness to action.

Keep reading: consultclarity.org/post/overcome-loneliness-at-the-top