During his three years on Saturday Night Live (SNL), he wrote such recurring sketches as "Mr.
Afterwards, O'Brien relocated from New York to Los Angeles to host his own incarnation of The Tonight Show for seven months until network politics prompted a host change in 2010.
Known for his spontaneous hosting style, which has been characterized as "awkward, self-deprecating humor", O'Brien's late-night programs combine the "lewd and wacky with more elegant, narrative-driven short films (remotes)".
O'Brien has been the subject of a documentary, Conan O'Brien Can't Stop (2011), and has also hosted a 32-city live comedy tour.
With the retirement of David Letterman on May 20, 2015, O'Brien became the longest-working of all current late-night talk show hosts in the United States, at 22 years.
In a Late Night episode, O'Brien paid a visit to County Kerry, Ireland, where his ancestors originated.
O'Brien attended Brookline High School, where he served as the managing editor of the school newspaper, The Sagamore.
He spent two years with that show and performed regularly with improvisational groups, including The Groundlings.
In January 1988, Saturday Night Live's executive producer, Lorne Michaels, hired O'Brien as a writer.
Conan Christopher O'Brien (born April 18, 1963) is an American television host, comedy writer, and television producer.