Donald Waldhaus competed in team épée for the US at the 1924 Paris Olympics after being selected after winning the US Junior title in épée in 1924. Waldhaus represented the Washington Square Fencers Club. Waldhaus served in World War I in the Army Medical Corps and was a member of the Veterans of Foreign Wars and the American Legion. He later opened his own insurance agency in Connecticut, was president of the Derby-Shelton Rotary Club in 1932, and also served as president of the Shelton Chamber of Commerce in 1960.