Allen Swift

Ira J. Stadlen (January 16, 1924 – April 18, 2010), known professionally as Allen Swift, was an American actor, writer and magician, best known as a voiceover artist who voiced cartoon characters Simon Bar Sinister and Riff-Raff on the ''Underdog'' cartoon show. He took his professional name from radio comedian Fred Allen and 18th century satirist Jonathan Swift. Provided by Wikipedia