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Daniel Louis Castellaneta, better known as Dan Castellaneta, is an American actor, voice actor, and comedian. He is best known for his work on the animated television series The Simpsons, where he voices numerous characters, including Homer Simpson, Grampa Simpson, Krusty the Clown, Barney Gumble, and Waylon Smithers. Castellaneta has also appeared in live-action films and television shows, such as The Wedding Singer, Futurama, and Parks and Recreation.