Conan Christopher O'Brien is an American television host, comedian, writer, and producer. He is best known for hosting several late-night talk shows; since 2010, he has hosted Conan on the cable channel TBS. O'Brien was born in Brookline, Massachusetts, and 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. O'Brien was a writer and producer for The Simpsons for two seasons until he was commissioned by NBC to take over David Letterman's position as host of Late Night in 1993. A virtual unknown to the public, O'Brien's 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.

From 1993 through 2009, he hosted Late Night with David Letterman. Before becoming the host of Conan on TBS in 2010, he hosted The Tonight Show with Conan O'Brien for a year.