"heeeeh, heeeh... Yeesss, master -- yeesssss..."
Sound familiar? You know that creepy-looking short fellow with the large eyes, unnerving grin, and odd accent? That's him. Used in many "creepy little guy" character roles throughout the 40's and 50's, usually in B-grade films.
One especially notable performance is in John Huston's rendition of The Maltese Falcon.