 He has hosted "Conan" since 2010 and has also hosted such events as the Emmy Awards and "Christmas in Washington".O'Brien has been the subject of a documentary, "Conan O'Brien Can't Stop" (2011), and has also hosted a 32-city live comedy tour and later an 18-city live comedy tour.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 26 years.