[1] Kroyer began his animation career in 1975 by working in a small commercial studio.

[2] It was then he met future Tron director Steven Lisberger, who was working on Animalympics.

[6] He was originally set to direct Quest for Camelot but left the project over creative differences.

Soon after he joined Rhythm and Hues Studios as Senior Animation Director and supervised the CGI animation for films such as Garfield, Scooby-Doo, Cats & Dogs and The Flintstones in Viva Rock Vegas.

In early 2009, he began teaching at Chapman University's Dodge College of Film and Media Arts in Orange, California.