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Conan Christopher O'Brien (born April 18, 1963) is an American talkshow host and writer, best known for his talkshows.
In fall of 1991, he signed on as a producer and writer for The Simpsons, where he also became a supervising producer. In a speech he gave at Harvard on Class Day in 2000, he credited The Simpsons with "saving" him, a reference to the career slump he was experiencing prior to his hiring for that show.
He wrote the episodes "New Kid on the Block", "Marge vs. the Monorail", "Homer Goes to College" and the wraparounds of "Treehouse of Horror IV". He also wrote the unproduced sequel to "Stark Raving Dad", which was intended to revolve around Prince. He also created the character of Horatio McCallister (the Sea Captain) and he named Patty and Selma Bouvier's iguana Jub-Jub (something he would say during awkward silences while writing). Of the episodes he wrote while there, he considers "Marge vs. the Monorail" to be his favorite. In the writer's room O'Brien used to act out jokes and other actions, entertaining the other writers.
He left The Simpsons in 1993 to host Late Night With Conan O'Brien, taking over after David Letterman left NBC for CBS. He was also interviewed in The Simpsons 20th Anniversary Special – In 3-D! On Ice! and performed "The Monorail Song" with the Gay Men's Chorus of Los Angeles in The Simpsons Take the Bowl.
 Supervising producer
 Guest starring