 Complete the following phrase:  Born in Brookline, Massachusetts, OBrien was raised in an Irish Catholic family. He served as president of The Harvard Lampoon while attending Harvard University, and was a writer for the sketch comedy series Not Necessarily the News. After writing for several comedy shows in Los Angeles, he joined the writing staff of Saturday Night Live. OBrien was a writer and producer for The Simpsons for two seasons until he was commissioned by NBC to take over David Lettermans position as host of Late Night in 1993. A virtual unknown to the public, OBriens initial Late Night tenure received unfavorable reviews and remained on a multiweek renewal cycle during its early years. The show generally improved over time and was highly regarded by the time of his departure in 2009. Afterwards, OBrien relocated from New York to Los Angeles to host his own incarnation of The Tonight Show for seven months until network politics prompted a 