Separated from his parents, Chief John (aka Frank Senior) and Rachael, Mount Pleasant was sent to attend Indian Boarding Schools at a young age. He eventually attended the Carlisle Indian Industrial School from 1905 to 1909, where he competed as both a long jumper on the track team and as a quarterback and halfback on the football team. The 1907 Carlisle Indian team, coached by Glenn Scobey Warner, went 10–1 with a 26–6 victory over perennial powerhouse, Harvard. The team's only loss of the season came against Princeton in a game in which Mount Pleasant did not play. Mount Pleasant's teammates included future Pro Football Hall of Famer, Jim Thorpe, and future College Football Hall of Fame inductee, Albert Exendine. Despite being a second-team All-American, Mount Pleasant never played profe