League of Denial devotes attention to the story of the football player who spent 16 years between which two teams?
League of Denial:  The book and film devote significant attention to the story of Mike Webster and his football-related brain injuries, and the pathologist who examined Webster's brain, Bennet Omalu. Mike Webster: Michael Lewis Webster (March 18, 1952September 24, 2002) was an American football player who played as a center in the National Football League from 1974 to 1990 with the Pittsburgh Steelers and Kansas City Chiefs.
Pittsburgh Steelers and Kansas City Chiefs