Dr. Thomas R Callahan specializes in psychiatry in Fresno area. Dr. Thomas R Callahan has a medical practice at 87 East Olive Avenue, Suite 100, Fresno CA, and has over 53 years of experience in the field of medicine. He graduated from his medical school with his medical degree in 1964. Dr. Callahan is accepting new patients at his medical office and practice location in Fresno, California. He is available for appointments, preventative care, medical care as well as ongoing patient care.