Reclusive director of satirical shorts and parody films such as Hardware Wars, which was based on Star Wars.
He co-created 20 original animated films for Sesame Street when his career started in the 1970s.
He did sound effects, including voice work, on Star Wars Episode II: Attack of the Clones and Star Wars Episode VI: Return of the Jedi.
He was born in San Francisco.
He passed on the opportunity to direct Pee-Wee's Big Adventure starring Paul Reubens.