Paul Gilbert (1918-1976), born Ed McMahon, was an American actor. He had a relatively short career in films and television, but was a successful nightclub performer.
Mr. Gilbert had also been an acrobat, and he demonstrated this skill during the famous "Hi-keeba!" scene in Experiment #104.
Gilbert was also the adoptive father of Melissa Gilbert, best known for playing Laura Ingalls on Little House On The Prairie.