His best-known roles include Litvak, the maniacal, miniature Hitler who menaces George Segal in film The Black Bird (his favorite role). He was also responsible for the physical performance of the robot Twiki in the TV series Buck Rogers in the 25th Century, a role for which the voice was supplied by Mel Blanc or Bob Elyea.

In part due to his short stature of 1.19 m (3 ft 11 in), he often doubled for children in such movies as The Towering Inferno, The Hindenburg, and Battlestar Galactica. Between movies, he frequently appeared in Las Vegas and Reno, Nevada, night clubs with his own musical combo, The Original Harmonica Band.