Dr. Joseph D. Diaz received his medical degree from the University of Texas Medical Branch at Galveston, Texas. Since opening his private practice, Allergy, Asthma and Immunology Associates of South Texas in 1988, Dr. Diaz has served as clinical assistant professor in the Department of Internal Medicine at the University of Texas Health Science Center in San Antonio. He was appointed Co-Director of the Allergy/Clinic Immunology Fellowship training program and directed the program for several years. He sees patients in the Medical Center and Stone Oak locations.