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2003-2005, and the Study on Global AGEing and Adult Health in 2006–2007. He is currently involved in initiating a major nationally representative longitudinal aging study, the Longitudinal Ageing Study in India, in collaboration with the Harvard School of Public Health and the U.S. National Institute on Aging. He has a Ph.D. in population studies from Annamalai University in India.

LISA BERKMAN is director of the Harvard Center for Population and Development Studies. A social epidemiologist whose work focuses extensively on psychosocial influences on health outcomes, her research has been oriented toward understanding social inequalities in health related to socioeconomic status, different racial and ethnic groups, and social networks, support, and social isolation. The majority of her work is devoted to identifying the role of social networks and support in predicting declines in physical and cognitive functioning and the onset of disease and mortality, especially related to cardiovascular or cerebrovascular disease. She has been an innovator in linking social experiences with physical and mental health outcomes and coedited the first textbook on social epidemiology, Social Epidemiology. She is a member of the Institute of Medicine and past president of the Society for Epidemiologic Research. She has M.A. and Ph.D. degrees in epidemiology from the University of California, Berkeley.

DAVID E. BLOOM is Clarence James Gamble professor of economics and demography at the Harvard School of Public Health, director of Harvard University’s Program on the Global Demography of Aging, and principal investigator of the Longitudinal Aging Study in India. Previously, he served on the faculty at Carnegie Mellon University and Columbia University. Bloom is an elected fellow of the American Academy of Arts and Sciences, a faculty research associate of the National Bureau of Economic Research (Programs in Labor Economics, Health Care, and Aging), and a member of the book review board of Science magazine. He chairs the World Economic Forum’s Global Agenda Council on Ageing and Society. He has written extensively on education and health in developing countries, labor and employment issues in the United States and globally, and environmental quality. His current interests include the effects of population health and population dynamics on economic growth and development, the value of vaccination, and population aging in India and other countries. He has a B.S. in industrial and labor relations from Cornell University and an M.A. in economics and a Ph.D. in economics and demography from Princeton University.

WEI CAI is a consultant working in the Development Research Group at the World Bank in Washington, DC. Her research interests include

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