Robert Reed Carradine (born March 24, 1954) is an American actor. The youngest of the Carradine family of actors, he made his first appearances on television western series such as Bonanza and his older brother David's TV series, Kung Fu. Carradine's first film role was in the 1972 film The Cowboys, which starred John Wayne and Roscoe Lee Browne. Carradine is probably best known for portraying fraternity president "Lewis Skolnick" in the Revenge of the Nerds series of comedy films and father Sam McGuire on the Disney Channel sitcom Lizzie McGuire.