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. He 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 (2003), 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 (2012)
- 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
- Shelldon in Rise of the Teenage Mutant Ninja Turtles
- Granola Guy: He 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.