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Former member of Chicago Second City Practices tai-chi. Vegetarian His voice characterization of Krusty the Clown on Fox-TV's "The Simpsons" was based on Chicago television legend Bob Bell who portrayed WGN-TV's Bozo from 1960-1984. Graduate of Northern Illinois University in DeKalb, Illinois. The phrase "d'oh" appears only as "Annoyed Grunt" in Simpsons scripts. Played Danny DeVito's client in The War of the Roses (1989), and his brother on The Simpsons. According to the producers of The Simpsons, he is so in character when playing Homer Simpson that when he makes a mistake during a line reading it is the type of mistake Homer would make. For example, in the episode "Homer Goes To College," Homer chants "I am so smart! I am so smart! S-M-R-T, I mean S-M-A-R-T!" His saying S-M-R-T was not scripted, improvised or even intended to be a joke, it was just a mistake. Popular stand up comedian and voice over actor of numerous cartoons and advertisements. Good friends with Tracey Ullman. They did a lot of comedy work together, and it was Ullman that got Dan his most famous role as Homer Simpson. Did some work at a Montreal, Canada radio station in 2004. According to "The Simpsons" creator Matt Groening, Dan is the one person he will not sit in with when Dan records voices, because Matt says that he finds Dan so funny when he records voices that he cannot stop himself from laughing, effectively ruining several takes. With all of the Voice over work he is done it is ironic that he appears as a semi-major character in "War of the Roses" and never uses his voice at all. As a child, Castellaneta would mimic cartoon voices from television. His father was an amateur actor, and Dan would try to do the accents with his father.