Tamara Harris, M.D., M.S., is chief of the Interdisciplinary Studies of Aging Section of the Laboratory of Epidemiology and Population Sciences in the Intramural Research Program of the National Institute on Aging. Dr. Harris earned her M.D. from Albert Einstein College of Medicine and has Master’s degrees in Epidemiology from the Harvard School of Public Health and from the Institute of Human Nutrition, Columbia College of Physicians and Surgeons. She trained in internal medicine at Montefiore Hospital in the Bronx, New York, and spent three years in a Fellowship in Geriatric Medicine at Harvard School of Medicine. Dr. Harris’ research interest focuses on lifelong patterns of daily activity and weight and how these contribute to weight related health conditions, change in body composition and health outcomes in old age. She is the principal investigator for the Health, Aging, and Body Composition Study and also the Age, Gene/Environment Susceptibility-Reykjavik Study, both of which are longitudinal studies of change in body composition in large older populations in the context of multi-morbidity.