Guzelian started his career in the late 1990s, working on Disney shows like American Dragon: Jake Long, Kim Possible, Hercules, Fillmore, and various direct-to-video material for the company.
He also wrote the teleplay for A Miser Brother's Christmas, the sequel to the Rankin/Bass special A Year without a Santa Claus.
- Power Rangers RPM
- The Penguins of Madagascar
- Peter Rabbit
- Ned's Declassified School Survival Guide
- Johnny Test