Sat Bir Singh Khalsa, Ph.D. has conducted research on yoga for physical and psychological health since 2001 and is a practitioner/instructor of Kundalini Yoga as taught by Yogi Bhajan since 1971. He is Research Director for the Kundalini Research Institute and the Kripalu Center for Yoga & Health, and an Assistant Professor of Medicine at Harvard Medical School. His research trials have evaluated yoga for insomnia, chronic stress, anxiety spectrum disorders, and mental health in schools. Dr. Khalsa works with the International Association of Yoga Therapists promoting yoga research as scientific director for the annual Symposium on Yoga Research and editor-in-chief of the International Journal of Yoga Therapy. He is author of the Harvard Medical School ebookYour Brain on Yoga, and chief editor of the medical textbook The Principles and Practice of Yoga in Health Care.