Musäus dubbed George Wendt on Cheers, Paul Dooley in Waiting for Guffman, Tim Barker and other guest actors on Doctor Who, and an assortment of police officers, reporters, and similar bit parts in films. He has worked most often in cartoons, dubbing Carl, Cletus, Professor Frink, and others on The Simpsons, as well as Cleveland on Family Guy, Eustace on Courage the Cowardly Dog, Mr. Gruber on The Adventures of Paddington Bear, Dr. Mindbender on G. I. Joe, and various robots (good and bad) on Transformers.