He is the president and CEO of the National Academy of Sports Medicine (NASM).
[1] He was the team physical therapist to the NBA's Phoenix Suns.
[2] He is an adjunct faculty member for the master’s of science in injury prevention and performance enhancement at the California University of Pennsylvania in California, Pennsylvania.
[3] Clark was a physical therapist for the St. Lucia national team at the 2000 Summer Olympics and Team USA Boxing at the 1996 Summer Olympics.
[2] He has written multiple books on physical therapy and its practices.