John Pomeroy started work at The Walt Disney Company in 1973 as a background artist, and became a full animator in 1974 to work on Winnie the Pooh and Tigger Too. While working at Disney, he met fellow animators Don Bluth and Gary Goldman, and began working with them on an independent short film project, Banjo the Woodpile Cat.

In 1979 he, Bluth, Goldman and several other Disney animators left the studio to form the independent studio Don Bluth Productions (later to become Bluth Group), which produced the film The Secret of NIMH and the animation for laserdisc video games Dragon's Lair and Space Ace. The independent studio encountered financial difficulties and declared bankruptcy in 1984, but reformed soon after as Sullivan Bluth Studios and opened a major animation facility in Dublin, Ireland.

Pomeroy remained at the Dublin studio to work as the directing animator and producer on An American Tail and The Land Before Time, before moving back to America in 1989 to form a new US wing of the company.

When Sullivan Bluth Studios closed, Pomeroy returned to Disney to work as the supervising animator on Pocahontas and other subsequent features featuring some of the most memorable villains.

John Pomeroy was also an animator for the films Curious George, Atlantis: The Lost Empire, Treasure Planet, and most recently, The Simpsons Movie.

He is a talented sculptor, and creates busts that animated film artists use to visualize a 3-D model of their character.

John Pomeroy is also a painter of historic events, and builder of historic weapons used in movies.

He is currently on the elders board at a Village Christian School in Sun Valley, California. -Wikipedia