Claire Twark, MD, is a staff psychiatrist at Brigham and Women's Hospital specializing in sports and addiction psychiatry. She completed the Harvard Longwood Psychiatry Residency Training Program and Partners HealthCare Addiction Psychiatry Fellowship at Massachusetts General, McLean, and Brigham and Women's Hospitals. She is a competitive triathlete and represents the Boston Triathlon Team. She completed the 2014 Ironman World Championship in Hawaii and is a four-time Ironman triathlon finisher. She previously ran track and cross country for Harvard College.