He helped the 1903 team coached by Fred Folsom to a 9–1 record including the school's first-ever win over Harvard.

Their seven wins included shutout victories over Kentucky, Tennessee, and traditional rival Miami.

[6] Foster added a 4–3 mark in 1905 before taking over the head coaching job at the University of Nebraska for the 1906 season.

[7] Foster replaced Walter C. Booth as head coach of the Nebraska football team for the 1906 season.

[8] Foster was head football coach at Miami University in Oxford, Ohio, for the 1907 and 1908 seasons.

His career winning percentage of .939 is the highest in Miami history ahead of College Football Hall of Fame coaches George Little, Ara Parseghian, Sid Gillman, Woody Hayes, and Bo Schembechler.