Karestan C. Koenen, Associate Professor, Department of Epidemiology, Mailman School of Public Health, Columbia University, USA,Sasha Rudenstine, Professor of Epidemiology and Psychiatry, Columbia University Epidemiology Merit Fellow, USA,Ezra Susser, Department of Epidemiology, Mailman School of Public Health, Columbia University, and New York State Psychiatric Institute, USA,Sandro Galea, Gelman Professor and Chair, Department of Epidemiology, Mailman School of Public Health, Columbia University, USA

Dr Koenen is a licensed clinical psychologist and epidemiologist who uses a life course epidemiologic approach to examine the interplay of genetic and environmental factors in the production of stress-related mental disorders. In particular, her work has sought to identify the determinants of stress-related mental disorders at multiple levels - from describing the social patterning of trauma exposure to examining the molecular mechanisms underlying disorder etiology. She has published over 150 scientific papers and is currently President of the International Society of Traumatic Stress Studies.

Sasha Rudenstine is an early-career investigator. She is interested in how genetic and environmental factors affect the manifestation of psychopathology over the life course and in how determinants at multiple levels - individual, network, and community - influence the prevalence, trajectories, and treatment of mental disorders globally. She received her B.A. from Haverford College and her Ph.D. in Clinical Psychology from City University of New York, USA.

Ezra Susser is Professor of Epidemiology and Psychiatry at Columbia University. He is Director of the Imprints Center for Genetic and Environmental Lifecourse Studies, and co-founder of the Global Mental Health Program at Columbia University. Much of his work has focused on neurodevelopmental disorders (ND) across the life course, including but not limited to autism and schizophrenia. He has studied early origins and prevention of ND, cross cultural differences in incidence and course of ND, improvement of mental health research and services for individuals with ND in low- and middle-income countries, and improvement of services for the most disadvantaged individuals with ND in high-income settings such as New York City. He is lead author of the only contemporary textbook (i.e. not edited chapters) on psychiatric epidemiology; won the 2011 Rema LaPousse Award for outstanding contributions in psychiatric epidemiology; and was in 2012 President of the American Psychopathological Association.

Dr Galea is a physician and an epidemiologist. He is the Anna Cheskis Gelman and Murray Charles Gelman Professor and Chair of the Department of Epidemiology at the Columbia University Mailman School of Public Health. Dr Galea's research program seeks to uncover how determinants at multiple levels including policies, features of the social environment, and genetic factors-jointly influence the health of urban populations. His work has documented the mental health consequences of mass trauma and conflict worldwide, including Hurricane Katrina, and the American wars in Iraq and Afghanistan. Dr Galea has published more than 400 scientific journal articles, 50 chapters and commentaries, and 7 books. Dr Galea serves as chair of the Community Services Board of the New York City Department of Health and Mental Hygiene and on the New York City Health Board. He is also president of the Society for Epidemiologic Research and a member of the Institute of Medicine of the National Academies of Science.