Premise: Conan O'Brien . 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 . 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 .
Hypothesis: Conan O'Brien hosts an American late-night talk show.
Label: ENTAILMENT