Dr. William Chang is a pulmonologist from San Juan Capistrano, California. He received his medical diploma from the Michigan State University College of Osteopathic Medicine. He continued his formative path with a residency in internal medicine at the Loma Linda University and a fellowship in pulmonary disease and critical care medicine at the same institution. Dr. Chang’s specialty is pulmonary disease and he is sub-specialized in general pulmonary medicine, critical care medicine, and asthma and COPD. Dr. Chang is board certified in internal medicine and critical care medicine. He currently collaborates with Mission Hospital and the Saddleback Memorial Medical Center.