05/14/2012 04:18 pm ET Updated May 14, 2012

Johnny Carson: Director Discusses 'King Of Late Night' (VIDEO)

Twenty years after he stepped down as host of The Tonight Show, PBS will premiere a documentary on Johnny Carson called "King of Late Night" as a part of its "American Masters" series. Peter Jones -- the documentary's director, producer, and writer -- appeared on CBS This Morning to discuss the project he's dreamed of for 15 years (he says he wrote Johnny a letter every year during that time, asking to collaborate on a documentary about the comedian).

Check out the video above for clips from the documentary, plus more on Carson's ability to "hide in plain sight" as a notoriously private celebrity, and what surprising fact Jones discovered about Johnny.