Conan O'Brien is a host on television.
Conan Christopher O'Brien ( born April 18 , 1963 ) is an American television host , comedian , and television producer . He is best known for hosting several late-night talk shows ; since 2010 he has hosted Conan on the cable channel TBS . 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 . 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 . The Tonight Show with Conan O'Brien was an American late-night talk show that featured Conan O'Brien as host from June 1 , 2009 , to January 22 , 2010 , as part of NBC 's long-running Tonight Show franchise .