Hosterman played soccer at Penn State in 1946 and 1947. He was one of four brothers to have played soccer at Penn State. Two brothers, Walter and Ralph, were team captains and First-Team All-America selections.[3][6][7] Ken Hosterman's career was cut short when he broke his leg during his second year.[8]
Hosterman began his coaching career at Penn State in 1953 succeeding Bill Jeffrey, who had been his coach.[9] During his 15-season tenure as head coach of the Nittany Lions Hosterman recorded 72 wins, 60 losses and 5 ties. His 1954 and 1955 teams were undefeated and untied, winning an outright national championship in 1954 and sharing the title in 1955.[2][3][10][11][12] Hosterman stepped down as Penn State's head coach after the conclusion of the 1967 season after accepting a position within the Penn State athletics program becoming the director of the Faculty-Staff Recreational and Fitness Program.[2]
Between 1950 and 1989, Hosterman served as an assistant professor in physical education at Penn State and was the athletic program's ticket manager between 1972 and 1976.[3]
Hosterman died in State College in April 2005. In September 2005, on the 50th anniversary of Penn State's national championship, a reunion of the survivors was held where Hosterman's granddaughter Stephanie Smith sang the national anthem.[13][14]