Dr. McCall is a Phi Beta Kappa graduate in psychology from the University of Wisconsin in Madison, where he also attended medical school. After completing his residency in primary care internal medicine, he practiced for more than 10 years in the Boston area before devoting himself full time to writing and research. His main focus since the year 2000 has been investigating the therapeutic aspects of yoga, as well as the scientific explanations of yoga’s effects. He became Yoga Journal's medical editor in 2002. He has traveled extensively, studying with many of the world's leading yoga teachers and yoga therapists including BKS Iyengar and TKV Desikachar. His primary teachers have been Patricia Walden, Rod Stryker and Donald Moyer. He has practiced yoga and meditation from various traditions for over 20 years and Tantra for more than a decade. Since 2005, he has studied with a traditional Ayurvedic doctor, Chandukutty Vaidyar, and has spent more than a year at his clinic in Kerala, India.
Timothy's articles have appeared in dozens of publications, both scientific and popular, including the New England Journal of Medicine, JAMA, The Los Angeles Times, and The International Journal of Yoga Therapy (where he serves on the Editorial Board). He has appeared repeatedly on national radio and television programs, given keynote lectures and workshops at numerous conferences including ones sponsored by Yoga Journal and The International Association of Yoga Therapists, and has lectured at the National Institutes of Health and the Smithsonian Institution.