Sat Bir Singh Khalsa, Ph.D. is a Corresponding Member of the Faculty of Medicine at Harvard Medical School retiring as Associate Professor of Medicine. He is Director of Research for the Kundalini Research Institute, Research Associate at the Benson Henry Institute for Mind Body Medicine, and Research Affiliate of the Osher Center for Integrative Medicine. He has practiced Kundalini yoga since 1971 and is a certified instructor and has been engaged in biomedical research on the efficacy of yoga for improving mental health since 2001. He has conducted clinical research trials evaluating yoga interventions for insomnia, post-traumatic stress disorder, chronic stress, and anxiety disorders, and also for adolescents in public schools and workers in occupational settings. He works with the International Association of Yoga Therapists to promote research on yoga and yoga therapy as editor-in-chief of the International Journal of Yoga Therapy and as chair of the scientific program committee for its annual Symposium on Yoga Therapy and Research. He is chief editor of the medical textbook The Principles and Practice of Yoga in Health Care, co-editor of the textbook The Principles and Practice of Yoga for Children and Adolescents, and medical editor of the Harvard Medical School Special Report: An Introduction to Yoga.