Sat Bir Singh Khalsa, Ph.D. is the Director of Yoga Research for the Yoga Alliance and the Kundalini Research Institute, and an Assistant Professor of Medicine at Harvard Medical School at Brigham and Women’s Hospital. He has conducted research on yoga and yoga therapy since 2001 and has been a practitioner/instructor of Kundalini Yoga since 1973. His research has evaluated yoga for insomnia, chronic stress, and anxiety-related disorders, and in workplace and public school settings. He works with the International Association of Yoga Therapists promoting yoga research as scientific director for the annual Symposium on Yoga Research and as editor-in-chief of the International Journal of Yoga Therapy. He is medical editor of the Harvard Medical School Special Report Introduction to Yoga, and chief editor of the medical textbook The Principles and Practice of Yoga in Health Care.