A real-life Surfer Dude, Greg was ranked #3 Junior Professional Surfer in the U.S. in 1998, the year he began his career in show biz. Has been vegan since age 8.
Greg is the frontman for the reggae/hip-hop band, Cipes and the People. The song Rescue on the band's 2007 release Conscious Revolution features teenage pop star Jesse Mc Cartney.
- Beast Boy in Teen Titans, Teen Titans Go!, Teen Titans Go! To the Movies, DC Super Hero Girls and Young Justice Outsiders.
- Caleb in W.I.T.C.H.
- Chiro in Super Robot Monkey Team Hyperforce Go!
- Iron Fist in Ultimate Spider-Man
- Kevin Levin in Ben 10: Alien Force, Ben 10: Ultimate Alien, Ben 10: Omniverse, and Ben 10 (2016)
- Michelangelo in Teenage Mutant Ninja Turtles (2012)
- Stinkfly in Ben 10 (2016)
- Marty on Sofia the First
- Granola Guy: Is vegan.
- Ink-Suit Actor: Beast Boy's goatee that he has sometimes was based off of Greg's own goatee, and Beast Boy's dog form was based off of one of Greg's dogs.
- Relationship Voice Actor: He and Ashley Johnson are cast as lovers in the shows they work together in.