Conan O'Brien is a television host.
Conan Christopher O'Brien ( born April 18 , 1963 ) is an American television host , comedian , and television producer . 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 . 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 . Late Night with Conan O'Brien is an American late-night talk show hosted by Conan O'Brien that aired 2,725 episodes on NBC between 1993 and 2009 .