David Letterman
In the early days of his career, David Letterman struggled as a stand-up comedian and lived out of his car while writing jokes for Jimmie Walker.
Today, with a net worth of around $400 million, Letterman donates to numerous charities. He credits Johnny Carson for his success, as his recurring guest spots on The Tonight Show, which stars Johnny Carson, helped launch his career and pave the way for his future stardom.
