 California governor Earl Warren asked his former classmate and fellow 1911 member of the University of California Band, Sproul to place his name in nomination for the office of vice president of the United States at the 1948 Republican National Convention in Philadelphia, Pennsylvania.Sproul retired in 1958.He became active in the Save the Redwoods League (after being a member since 1921) and in the East Bay Regional Park District and served on the National Park Advisory Board.