He is one of the nation’s foremost experts in hyperbaric medicine, pioneering its use to treat wounds, brain trauma, multiple sclerosis, and other conditions. He has served on the faculties of the Johns Hopkins School of Medicine, Tulane University School of Medicine, and LSU Medical School. He has also served as the chief of the Radioisotope Laboratory at the U.S. Naval Hospital in Bethesda, M.D. Dr. Maxfield was chief of the Radiation Therapy Department and co-chairman of the Nuclear Medicine Laboratory at Ochsner Clinic and Ochsner Foundation Hospital in New Orleans. He is currently in private practice in the Tampa Bay, Fla., area.