Marc E. Agronin, MD, a graduate of Harvard University and the Yale School of Medicine, is an adult and geriatric psychiatrist, and the author of HOW WE AGE. Since 1999 he has served as the director of mental health services, clinical research and the outpatient memory centre at Miami Jewish Health. He is a regular contributor to the New York Times and Scientific American Mind, and writes regularly on aging and retirement issues for the Wall Street Journal.