After seemingly endless public fighting and controversy, Conan O'Brien has departed NBC's "The Tonight Show."
First hosted by comedian Steve Allen in 1954, "The Tonight Show" has seen many lead the talk show. From Allen and Jack Paar to the venerable Johnny Carson and now O'Brien, the program is full of comic history. Jay Leno reigned as king of "The Tonight Show" from 1992-2009 after nabbing, some would argue "stealing," the show from David Letterman upon Carson's retirement.

