Fifty years ago, Johnny Carson became the host of NBC's The Tonight Show. During his 30 years as host, he reached a nightly audience of 15 million people and became one of the most trusted and famous men in America. But Carson was intensely private off-screen, and very few people — including members of his own family — really knew him. Documentary filmmaker Peter Jones wanted to try and change that. Weekends on All Things Considered host Guy Raz talks to director Peter Jones about his new documentary, Johnny Carson: King of Late Night which airs on PBS Monday, May 14.