Corey Keyes

Introduction

Corey L. M. Keyes is an American sociologist and psychologist at Emory University who redefined mental health as something more than the absence of mental illness. Working at the boundary of sociology, psychology and public health, he proposed that mental health and mental illness are related but separate continua, and he named the two poles of the mental health continuum: flourishing, a state of high emotional, psychological and social well-being, and languishing, its absence. His operational measure, the Mental Health Continuum-Short Form, is one of the most widely translated positive mental health instruments in the world and has been built into national health surveillance in Canada and elsewhere. The vocabulary he introduced entered general use well beyond the academy, most visibly when "languishing" became a widely shared description of pandemic-era malaise two decades after he coined it.

Early Life and Education

Keyes grew up in Wisconsin. He took his B.A. at the University of Wisconsin–Eau Claire, then completed both an M.S. and a Ph.D. at the University of Wisconsin–Madison, training in the sociology of mental health at a time when the field was dominated by the study of disorder. That grounding is visible throughout his work: where psychologists of well-being tended to locate flourishing inside the individual, Keyes treated it as a property of people in social roles and communities, and insisted that functioning well in society is part of mental health rather than a byproduct of it.

Academic and Professional Career

Keyes joined the faculty at Emory University in Atlanta, where he has spent his career, holding appointments in the Department of Sociology and in the Department of Behavioral Sciences and Health Education. His early work concerned the sociology of mental health, aging, and the conditions that support positive social relationships; he later extended the flourishing framework to the study of aging, arguing that well-being is a resource for navigating later life rather than a fixed trait that declines with it.

His work moved early into policy. Keyes collaborated with the U.S. Centers for Disease Control and Prevention on integrating well-being measures into health surveillance, and in 2012 the Department of Health and Human Services invited him into the first health-related quality of life and well-being working group for the Healthy People 2020 objectives. His complete state model has been used by the Public Health Agency of Canada in its national mental health surveillance programme. He serves on the advisory board of the World Happiness Forum and is a member of the Positive Psychology Network. In 2024 he published his first trade book, Languishing: How to Feel Alive Again in a World That Wears Us Down.

Major Contributions to Psychology

The dual-continuum model

The starting point of Keyes's 2002 paper in the Journal of Health and Social Behavior was a complaint about measurement: psychology had elaborate instruments for mental illness and almost nothing for mental health, so "not depressed" was treated as equivalent to "well." He proposed that mental health is a syndrome of symptoms of positive feelings and positive functioning, and that it varies independently of mental illness. On this two-continua view a person can be free of any diagnosable disorder and still be languishing, and can be managing a disorder while retaining substantial well-being.

Keyes formalised this as the complete state model, which cross-classifies people by their position on both continua: complete mental health (flourishing and no disorder), incomplete mental health (languishing without disorder), incomplete mental illness (a disorder without languishing) and complete mental illness (both). The model's practical claim is that screening only for disorder misses the large group of people who are not ill but are also not well, and that promoting mental health is a separate task from treating illness rather than the same one.

Flourishing, languishing and the structure of well-being

Keyes defined mental health along three dimensions. Emotional well-being covers positive affect and life satisfaction. Psychological well-being draws on Carol Ryff's eudaimonic model of self-acceptance, personal growth, purpose, autonomy, environmental mastery and positive relations. Social well-being is Keyes's own addition, and is the dimension that most distinguishes his framework from other models of flourishing: it holds that a mentally healthy person functions well not only inwardly but in relation to their community, through social acceptance, social actualization, social contribution, social coherence and social integration.

Flourishing is defined as high levels on hedonic and eudaimonic well-being together; languishing as low levels on both. People who meet neither criterion are classified as moderately mentally healthy. Keyes applied the diagnosis to data from the 1995 Midlife in the United States survey, a nationally representative sample of 3,032 adults aged 25 to 74. Among the 85.9 per cent without a depressive episode, 17.2 per cent met criteria for flourishing, 56.6 per cent were moderately mentally healthy and 12.1 per cent were languishing; across the full sample, reported prevalence was 21.6 per cent flourishing and roughly 20 per cent languishing. The dose-response relationship with depression was the headline finding: languishing adults were about twice as likely as moderately healthy adults and several times more likely than flourishing adults to have had a major depressive episode in the previous year, and reported substantial impairment in emotional health, activities of daily living and workdays lost.

The Mental Health Continuum-Short Form

To make the construct usable in surveys, Keyes reduced the original 40-item instrument to 14 items, selecting what he described as the most prototypical item for each facet of well-being. The MHC-SF asks how often in the past month respondents experienced each item, and scores are used either continuously or to assign a categorical diagnosis. The standard rule counts a person as flourishing if they report at least one of three emotional well-being items and at least six of eleven psychological and social well-being items occurring "almost every day" or "every day." The MHC-SF has been translated and validated in dozens of countries and is now among the most widely used measures of positive mental health.

From measurement to surveillance

The portability of the instrument is what carried the model into policy. Because the MHC-SF is short enough for national surveys, it allowed governments to report on positive mental health alongside morbidity, and a body of epidemiological work followed. In a nationally representative Dutch study, flourishing as opposed to non-flourishing was associated with a 28 per cent lower risk of first-onset mood disorder and a 53 per cent lower risk of anxiety disorder over three years. Keyes's 2007 review in American Psychologist summarised the case for mental health promotion as a complement to treatment, reporting that completely mentally healthy adults had the fewest missed workdays, the lowest cardiovascular risk and the least healthcare utilisation.

Major Publications

  • Keyes, C. L. M. (1998). Social well-being. Social Psychology Quarterly, 61(2), 121–140.
  • Keyes, C. L. M. (2002). The mental health continuum: From languishing to flourishing in life. Journal of Health and Social Behavior, 43(2), 207–222.
  • Keyes, C. L. M., & Haidt, J. (Eds.). (2003). Flourishing: Positive Psychology and the Life Well-Lived. Washington, DC: American Psychological Association.
  • Keyes, C. L. M. (2005). Mental illness and/or mental health? Investigating axioms of the complete state model of health. Journal of Consulting and Clinical Psychology, 73(3), 539–548.
  • Keyes, C. L. M. (2007). Promoting and protecting mental health as flourishing: A complementary strategy for improving national mental health. American Psychologist, 62(2), 95–108.
  • Keyes, C. L. M., & Goodman, S. H. (Eds.). (2006). Women and Depression: A Handbook for the Social, Behavioral, and Biomedical Sciences. Cambridge: Cambridge University Press.
  • Keyes, C. L. M., et al. (2008). Evaluation of the Mental Health Continuum-Short Form (MHC-SF) in Setswana-speaking South Africans. Clinical Psychology & Psychotherapy, 15(3), 181–192.
  • Keyes, C. L. M. (2024). Languishing: How to Feel Alive Again in a World That Wears Us Down. New York: Crown.

Note: Keyes co-edited Flourishing with Jonathan Haidt; it is an edited volume, not a single-authored work.

Impact and Legacy

Keyes changed the terms of the discussion. The claim that mental health is a complete state rather than the absence of illness is now embedded in public health language, in the design of national surveys, and in the positive psychology literature more broadly, where his work sits alongside that of Martin Seligman. His concepts reached a mass audience in 2021 when "languishing" was popularised as a description of pandemic-era emptiness, and he followed with a trade book for general readers.

The measurement apparatus he built has also drawn sustained criticism. The largest concern is the stability of the flourishing diagnosis. A 2017 construct validation of the MHC-SF in the Canadian population found that prevalence estimates ranged from about 20 per cent among Setswana-speaking South Africans and 28.5 per cent among Italian adults to 37.9 per cent among American youth and 49.3 per cent among American college students, while the same instrument produced a figure of 76.9 per cent for Canada in 2012, a spread that raised concerns about how the scale functions in population surveys. The same authors noted that it is unclear whether anything beyond investigator judgment was used to select the fourteen short-form items, and objected to applying a diagnostic analogy drawn from major depressive disorder to a positive state. Because the criterion requires at least one emotional item plus at least six of eleven others, a person can score high on psychological well-being and low on social well-being and still be classified as flourishing, which sits awkwardly with a theory that requires high standing on all three.

The factor structure is contested as well. Validation studies commonly support the correlated three-factor model, but several recent analyses favour a bifactor model in which all items load on a general well-being factor, and some researchers argue the instrument is close to unidimensional, which would undermine the interpretation of the three subscales. The social well-being subscale has repeatedly shown only moderate reliability relative to the others. There is also a conceptual objection to the enterprise: defining a large share of the population as languishing imports a diagnostic frame into ordinary dissatisfaction, and because the two continua are correlated rather than orthogonal, the strength of the independence claim is an empirical question that different samples answer differently. Keyes's own prevalence figures shifted between papers using the same dataset, an illustration of how sensitive the diagnosis is to how the cut points are applied.

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References

  • Keyes, C. L. M. (2002). The mental health continuum: From languishing to flourishing in life. Journal of Health and Social Behavior, 43(2), 207-222.

Last updated: 2026-10-20

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