MD, MPH. Scientist in epidemiology, gerontology and geriatrics. Has led scientific work to define frailty and its causes and potential for prevention as keys to optimizing health for older adults. Former Director, Division of Geriatric Medicine and Gerontology, and Center on Aging and Health, The Johns Hopkins Medical Institutions. Currently, Dean and DeLamar Professor of Public Health, Mailman School of Public Health, Columbia Univ. Professor of Medicine, College of Physicians & Surgeons Columbia. Senior Vice-President, Columbia University Medical Center. Co-Designer and Co-Founder, Experience Corps. Member: U.S. National Academy of Medicine; MacArthur Network on an Aging Society; Steering Committee, Human-Centric Health. Elected Member, NAM Council. President, Association of American Physicians. Co-Chair, Global Future Council on the Future of Human Enhancement, World Economic Forum. Recipient of wards.