Garcia began his career as a stand-up comedian, starting in 1991 at the age of fourteen, he continued his stand-up comedy through the 90s at comedy clubs in Southern, California before getting into acting in 1995.Garcia is known for portraying Sheen Estevez in Jimmy Neutron: Boy Genius and its spin-off series The Adventures of Jimmy Neutron: Boy Genius and Planet Sheen on Nickelodeon. He also guest starred on the animated series Clone High. He was also the leader of the KMRK-FM 96.1 Wild Wake-Up crew. He also voices "Tyler Nelson" in The Maw franchises, "Pip" the mouse in the 2006 film Barnyard, and he continued to provide the voice of the same character for the television show Back at the Barnyard. He voiced "Rinaldo" the penguin in the 2006 film Happy Feet. He is rumored to be the voice of Suneo Honekawa in the anime series Doraemon and in the anime film The New Record of Nobita: Spaceblazer. He has appeared on one of the half-hour comedy special Comedy Central Presents in May 2006. He was a contestant in the Comedy Central series Reality Bites Back, but quit after the first day. He also voiced Tipa, one of the smugglers and the bat in the 2011 animated comedy film, Rio. In the 2nd film Rio 2, he voices a spoonbill and an auditioning Spix's Macaw named Peri.