Loren Fishman, MD, a physiatrist and assistant clinical professor at Columbia College of Physicians and Surgeons and medical director of Manhattan Physical Medicine & Rehabilitation, both in New York City. Dr. Fishman studied yoga in India with BKS Iyengar and uses it in his rehabilitation practice. He recently created a yoga safety app called Yoga Injury Prevention (YIP), which includes a list of yoga poses contraindicated for those with common medical conditions, YIP.World. He has written several books, including Healing Yoga. His website is Sciatica.org.