David J. Chao, MD aka "ProFootballDoc" was the head team physician for the San Diego Chargers for 17 years. He is a board-certified Orthopaedic Surgeon with a Subspecialty Certification in Sports Medicine, who has been engaged in an active San Diego practice since 1995. He is a member of the international ACL Study Group, the NFL Physicians Society, American Orthopaedic Society for Sports Medicine, American Academy of Orthopaedic Surgeons and is an Assistant Clinical Instructor at UCSD.

Dr. Chao served as a team physician for many sports teams and events, including former Chief Medical Officer for ESPN’s X Games at over two dozen summer and winter games. He is the former Team Physician for the USA Sevens Rugby Team and served as Team Physician for many universities and high schools. He has been a medical consultant for the WWE and a host physician for the USA Olympic Committee. Many MLB, NBA, NHL, and NFL athletes across the nation consult with Dr. Chao to obtain his recommendations.