Charles A. Czeisler, PhD, MD, graduated magna cum laude with a degree in Biochemistry and Molecular Biology from Harvard College, was subsequently inducted into Phi Beta Kappa, and received his PhD in Neuro- and Bio-behavioral Sciences and his MD from Stanford University. He is Director of the Sleep Health Institute and Chief of the Division of Sleep and Circadian Disorders in the Departments of Medicine and Neurology at the Brigham and Women’s Hospital; the Frank Baldino, Jr, PhD Professor of Sleep Medicine, Professor of Medicine, Director of the Division of Sleep Medicine, and an Affiliate Faculty Member in the Neuroscience Program at Harvard Medical School (HMS). His research is in the field of basic and applied research on human circadian rhythms and sleep-wake function and the impact of sleep loss on vigilance, neurobehavioral performance, and health. Dr. Czeisler is a member of the National Academy of Medicine, the American Clinical and Climatological Association, the International Academy of Astronautics, and a Fellow of the Royal College of Physicians (London), the American Physiological Society, the American Society for Clinical Investigation, and the Association of American Physicians. He was formerly President of the Sleep Research Society and Chair of the Board of Directors of the National Sleep Foundation.