Herbert Orin "Fritz" Crisler was an American college football coach who is best known as "the father of two-platoon football", an innovation in which separate units of players were used for offense and defense. Crisler developed two-platoon football while serving as head coach at the University of Michigan from 1938 to 1947. He also coached at the University of Minnesota (1930–1931) and Princeton University (1932–1937). Before coaching, he played football at the University of Chicago under Amos Alonzo Stagg, who nicknamed him Fritz after violinist Fritz Kreisler.

Amos Alonzo Stagg was an American athlete and college coach in multiple sports, primarily American football. He served as the head football coach at the International YMCA Training School (1890–1891), the University of Chicago (1892–1932), and the College of the Pacific (1933–1946), compiling a career college football record of 314–199–35 (.605). His undefeated Chicago Maroons teams of 1905 and 1913 were recognized as national champions. He was also the head basketball coach for one season at Chicago (1920–1921), and the Maroons' head baseball coach for twenty seasons.