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As of 2008, Dan makes $400,000 per episode of The Simpsons.
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When Dan was a student teacher, he used to engage the children with his 'voices', and they were so impressed they said he ought to be in Hollywood - giving him pause to rethink his career.
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In the summer of 2008, Dan appeared on stage in Broadway Bound, with JoBeth Williams and Jonathan Silverman.
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Dan's favorite film is
The Producers. His favorite TV show, past or present, is
Taxi, and his favorite music is anything sang by
The Beatles. His favorite book is
The Book: On the Taboo Against Knowing Who You Are by Alan Watts.
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Dan wrote the play The Purple Dawn, staged in Geneva College, Beaver Falls in Pennsylvania.
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Dan's video game voice credits include Flux Wildly in Toonstruck, Homer Simpson, Grandpa Abe Simpson, and Barney Gumble in The Simpsons: Virtual Springfield, Earthworm Jim and Boogerman in Clayfighter 63 1/3, and Nordom in Planescape: Torment.
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Dan is 5'10" (1.78 m) tall.
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Dan's theatrical credits include The Alchemist, Where Did Vincent Van Gogh, Lost in Yonkers, Macbeth, Tom and Jerry, Catch 27, Cows on Ice, How Green Were My Values, Mirrors at the Border, Orwell That Ends Well, A Midsummer Night's Dream, and The Taming of the Shrew.
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Sometimes screw-ups turn out to be good. In an episode of
The Simpsons, it was scripted that Homer would sing "I am so smart, I am so smart, S-M-A-R-T". But when Dan read it, he screwed up and said "I am so smart, I am so smart, S-M-R-T I mean, S-M-A-R-T". The editors liked the change so much that they kept it in and it is in the episode to this day. The line also appears in the video games
The Simpsons: Hit and Run and
The Simpsons: Road Rage.
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Dan won an Emmy in 1992 (Outstanding Voice-Over Performance) for
The Simpsons' episode "
Lisa's Pony". He won again in 1993 for the episode "
Mr. Plow", in 2004 for "
Today I Am A Clown" and for a fourth time in 2009 for the episode "Father Knows Worst".
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Dan guest-voiced as himself in an episode of
The Simpsons where he talked to Homer.
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In one episode of
The Simpsons, Fat Tony and his minions were discussing who to "whack". Some of the people they said they would kill were the members of the Castellaneta family.
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Once asked in an interview what "D'oh!" means. He replied that he thought "D'oh!", the trademark line of his
The Simpsons character Homer, was a euphemism for "damn".
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Dan lent his voice for the TV commercials for Butterfinger bars, Office Depot (1998), Intel (1998), and Mastercard credit card (2004).
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Dan appeared in the following albums: The Simpsons Sing the Blues in 1990, Fear and Loathing in Las Vegas in 1996, and The Simpsons Songs in the Key of Springfield in 1997.
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He is a vegetarian, doesn't drink, and practices tai-chi.