Daniel Louis Castellaneta is an American actor, voice actor, comedian and screenwriter. Castellaneta is best known for voicing Homer Simpson on the animated series The Simpsons (1989) (as well as other characters on the show such as Abraham "Grampa" Simpson, Barney Gumble, Krusty the Clown, Sideshow Mel, Groundskeeper Willie, Mayor Quimby, and ...