He graduated from St. Lawrence with a B.S. in biology, obtained his medical degree from the Mount Sinai School of Medicine, and completed his residency in orthopedic surgery at the Mount Sinai Hospital. Mark also completed a fellowship in sports medicine at the University of Chicago. Dr. Klion is a clinical instructor at the Mount Sinai School of Medicine and a partner at Manhattan Orthopedics and Sports Medicine Group. He is also the director of orthopedics at St. Barnabas Hospital in Bronx, N.Y. Dr. Klion performs the newest techniques for knee, shoulder and hip arthroscopy and reconstructions. A triathlete, he is medical director for the New York City Triathlon. He has recently written a book, Triathlon Anatomy, published by Human Kinetics 2102.