John R. Burton, M.D., is director of the Johns Hopkins Geriatric Education Center, a professor of medicine at the Johns Hopkins School of Medicine, and a professor in the Bloomberg School of Public Health and the Johns Hopkins University School of Nursing. William J. Hall, M.D., is director of the Center for Healthy Aging at Highland Hospital, in Rochester, New York, the Paul Fine Professor of Medicine at the University of Rochester School of Medicine and Dentistry, and former president of the American College of Physicians. Between them, Drs. Burton and Hall have nearly 90 years of medical experience.