Nationally, Dr. Castillo is considered one of Arizona’s leading pain specialists. He is a graduate of the University of New Mexico School of Medicine; completed an internship with Phoenix Integrated Surgical Residency; and completed his anesthesia residency through the University of Arizona School of Medicine. Considered a leading expert in spinal cord stimulation and intrathecal catheter medication management for chronic pain syndromes, he has practiced medicine in Phoenix for twenty years.