Robert Carradine is an American actor best known for his portrayal of fraternity president "Lewis Skolnick" in the Revenge of the Nerds series of comedy films. Carradine reprised the role of Skolnick in three sequels, taking over as executive producer in the latter two. In 2001 he played Donald Keeble in Max Keeble's Big Move. In 2000 he co-starred with Caroline Rhea in Mom's Got a Date with a Vampire. He played the father Sam McGuire on Lizzie McGuire from 2001-2003. The show starred Hilary Duff as Lizzie and was widely popular among girls. The show's realistic approach to the problems of a 13-year-old girl also appealed to parents. He reprised his role as Sam McGuire in The Lizzie McGuire Movie in 2003.
In January 2013, he and former Revenge of the Nerds co-star, Curtis Armstrong, hosted King of the Nerds on TBS, a reality TV series in which a group of nerds compete to find out which one is the nerdiest.