Elissa Epel, PhD, is a leading health psychologist who studies stress, aging, and obesity. She is the director of UCSF’s Aging, Metabolism, and Emotion Center and is associate director of its Center for Health and Community. She is a member of the National Academy of Medicine and serves on scientific advisory committees for the National Institutes of Health and the Mind & Life Institute. She has received awards from Stanford University, the Society of Behavioral Medicine, and the American Psychological Association. She is the coauthor of the New York Times bestseller The Telomere Effect.