O'Brien's shift from NBC to TBS stemmed from the 2010 "Tonight Show" conflict between O'Brien and former "Tonight Show" host Jay Leno. The controversy occurred when, due to the low ratings of "The Jay Leno Show" and "The Tonight Show with Conan O'Brien", NBC announced that Leno would be moved from 10:00 p.m. to 11:35 p.m. and O'Brien would be moved from 11:30 p.m. to 12:05 a.m. The announcement occurred seven months after "The Tonight Show with Conan O'Brien"s premiere, and over four years after it was made known that O'Brien would replace Leno as the "Tonight Show" host. Ultimately, NBC Universal chief Jeff Zucker's decision to reschedule O'Brien and Leno's time slots led to O'Brien's departure from the network and a public outcry from O'Brien's fans on social media sites like Twitter and Facebook.