He appeared as himself in the Disney's Wonderful World episode "The Mouseketeer Reunion" and the eighth episode of The Muppet Show. He also appeared as a piano player in The Muppet Movie and portrayed the Chief Elf in A Muppets Christmas: Letters to Santa. He wrote and composed the songs and score for The Muppet Movie, The Muppet Christmas Carol and A Muppets Christmas: Letters to Santa. He will voice Future Danny in Future-Worm!.