MARGIE E. LACHMAN, PhD, is Professor of Psychology and Director of the Life-span Developmental Psychology Laboratory at Brandeis University. She was a member of the John D. and Catherine T. MacArthur Foundation Research Network on Successful Midlife Development, which conducted a large-scale survey of Americans in midlife. Lachman is a fellow of the American Psychological Association, Division on Adult Development and Aging and the Gerontological Society of America. Lachman is also currently the editor of the Journal of Gerontology: Psychological Sciences. Her research program examines personality, cognitive changes, and health in midlife and old age.