Steven H. Richeimer, MD, is board certified in pain medicine, anesthesiology, and psychiatry. He is a professor in the Departments of Anesthesiology and Psychiatry and the Chief of the Division of Pain Medicine at the University of Southern California. Alexander Chen, MD, is a board-certified anesthesiologist and interventional pain medicine specialist. He is an assistant professor in the Department of Anesthesiology and Pain Medicine at the University of Southern California.