Dan Castellaneta
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Daniel Louis Castellaneta is an American actor and comedian. He is best known for voicing Homer Simpson on the animated series The Simpsons. Castellaneta is also known for voicing Grandpa in Nickelodeon's Hey Arnold!, and has had voice roles in several other programs, including Futurama, Sibs, Darkwing Duck, The Adventures of Dynamo Duck, The Batman, Back to the Future: The Animated Series, Aladdin, Earthworm Jim, and Taz-Mania.
Castellaneta with fellow Simpsons voice actors Nancy Cartwright, Yeardley Smith and Julie Kavner in 2009
Grampa Simpson
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Abraham Jebediah "Abe" Simpson II, better known as Grampa Simpson, is a recurring character in the animated television series The Simpsons. He made his first appearance in the episode entitled "Grandpa and the Kids", a one-minute Simpsons short on The Tracey Ullman Show, before the debut of the television show in 1989.
Dan Castellaneta voices Grampa and several other recurring characters
Writer David Mirkin thinks that what makes Grampa funny is that the "boring" and "tedious" things he says are "actually funny" in the context of the boredom and the tedium.