Orthopedics Sports Medicine Arthritis Michael Brennan, M.D. is Board Certified in Orthopaedic Surgery and received his medical degree from the Medical College of Wisconsin in Milwaukee, WI. He completed his residency at the University of Michigan and completed his fellowship at the San Francisco General Hospital in San Francisco, California. Dr. Brennan is currently Team Physician for the Arizona Diamondbacks, Arizona Cardinals and is a member of the National Football League Physician Association. He is also a member of the Orthopaedic Trauma Association, American Academy of Orthopaedic Surgeons, and the Arizona Orthopaedic Society.