Jeffrey Garcia (born May 3, 1977)[1] is an American stand-up comedian, actor and voice actor,[2] who is best known for voicing Sheen Estevez in Jimmy Neutron: Boy Genius, and its two Nickelodeon spin-off television show series The Adventures of Jimmy Neutron: Boy Genius and Planet Sheen, as well as Pip the Mouse in Barnyard and its spin-off television show series Back at the Barnyard.