For Disney, he voiced Paddywhack in the Disney TV series Darkwing Duck, Air Conditioner and Hanging Lamp in the 1987 feature The Brave Little Toaster, Jiji the cat in Kiki's Delivery Service, and various others listed below.
- Sea Captain in DuckTales
- Paddywhack in Darkwing Duck
- Morris in The Enchanted Tiki Room: Under New Management
- T.O.M. 2000 in ExtraTERRORestrial Alien Encounter (original version, replaced by Tim Curry)
- Air Conditioner and Hanging Lamp in The Brave Little Toaster
- Jiji the cat in Kiki's Delivery Service (English dub)
- Ace London in TaleSpin
- Gary Young in Houseguest
- His surname was actually Hartmann, but he removed the second "n" to improve his i-ching number.
- He was considered to voice Genie in Aladdin along with several other actors before the role was eventually given to Robin Williams.