He’s one of the few people whose expertise is sought after by both the NFL and the NFLPA. Dr. Cantu is also co-founder of the Sports Legacy Institute with Chris Nowinski. He has been at the forefront of the issue of concussions in athletics for decades. In 1986, he designed a concussion grading scale that outlined return to play guidelines. In this film he is a medical expert but beyond that he diagnosed and treats Kyle Turley among other professional athletes.