Conan O'Brien, the dominant late-night host at 12:35 a.m. (ET) for the past 14 seasons, will succeed Jay Leno as host of the preeminent series on late-night television, NBC's "The Tonight Show," in June of 2009.

Beginning in Spring 2009, Jimmy Fallon will step in as the "Late Night" host. "The Tonight Show with Conan O'Brien" will begin on Monday, June 1, 2009 (11:35 p.m.-12:35 a.m. ET) with Leno's last "Tonight Show" telecast airing Friday, May 29, 2009.

"'The Tonight Show' has a remarkable history rich in tradition. We're proud of each and every show Jay has shared with America as we look forward to Conan carrying on that outstanding tradition next year," said Rick Ludwin, Executive Vice President, Late Night and Primetime Series, NBC Entertainment. "We also can't wait for Jimmy to showcase his winning style following Conan. Jay has left his personal stamp on 'The Tonight Show' for what will be 17 years. He is enormously creative, generous and professional."