As Hollywood's most versatile vocal talent, John is the only actor to voice a role in all of the Pixar films. It began with the charming and witty Hamm the piggy bank in Toy Story 1 (1995) and 2 (1999), and then came P.T. Flea, the excitable circus ringmaster in Bug's Life (1998), and the lovable snow monster Yeti in Monsters, Inc.(2002). In the best-selling DVD in history, John plays the ever-changing school of Moonfish in Finding Nemo (2003). He is heard as the Under Miner in the Incredibles (2005) and as Mack The Truck in 'Cars' (2006).

Pixar artists always include John's recognizable eyebrows and mustache as part of the animated characters' charm. Pixar has been quoted as saying that "John is our good luck charm." John replies, "as an actor, it's a joy to be working with the Pixar team...it's really refreshing to work with people who know what they're doing and I hope this relationship continues for a long time." Smiling, John can't help but add, "I've already put my application in as a custodian at their new building."