what sports did the third person played?
football
John Mackey (American football)
John Mackey (September 24, 1941 – July 6, 2011) was an American professional football player who was a tight end for the Baltimore Colts and the San Diego Chargers. 
what is achelousaurus? It is a genus of centrosaurine ceratopsid dinosaur. describe its social behavior? They were herding animals, due to the large number of known bone beds containing multiple members of the same ceratopsian species. where did it get its name? It is named after a Greek mythological figure. who named it? Scott D. Sampson who is he? He is a Canadian paleontologist and science communicator. did he join any institute or university? Yes, at the New York College of Osteopathic Medicine on Long Island. mention a few of his works? He hosted "Dinosaur Planet", and published a book. where was he born? Vancouver, British Columbia. name a few famous sportspeople from the aforementioned island? Jim Brown, Julius Erving, John Mackey, Whitey Ford, Nick Drahos, and Carl Yastrzemski.
wiki:14506251
John Mackey (American football) [SEP] Introduction
John Mackey (September 24, 1941 – July 6, 2011) was an American professional football player who was a tight end for the Baltimore Colts and the San Diego Chargers. He was born in Roosevelt, New York and attended Syracuse University. He was the first president of the National Football League Players Association following the AFL-NFL merger, serving from 1970 to 1973. Mackey was also a major reason the NFLPA created the "88 Plan", which financially supports ex-players who required living assistance in later years. A five-time Pro Bowler, Mackey was inducted into the Pro Football Hall of Fame in 1992, the second pure tight end elected.