He is, however, probably most famous for his Emmy-nominated role as Cliff Clavin on the TV show Cheers. Besides voicing a character in all Pixar films, he is also a team member of the Pixar Softball Team. Ratzenberger also hosted the documentary film Pixar: 20 Years of Animation and Counting. He said in an interview that out of all the characters he has voiced for Pixar, P.T. Flea from A Bug's Life is his favorite one that he's done. Ratzenberger was married to Georgia Stiny from 1984-2004 (divorced) by whom he has two children: a son named James John Ratzenberger born in 1987 and a daughter named Nina Katherine Ratzenberger born in 1989.
On November 6, 2012, John Ratzenberger married his girlfriend Julie Blichfeldt.
- Ratzenberger has stated P.T. Flea in A Bug's Life is his favorite role that he has done for Pixar.
- Ratzenberger had a cameo in DisneyToon Studios' Cars spin-off Planes, as the voice of jet tug Harland. He also voiced Brodi Enid in the film's sequel Planes: Fire & Rescue.