David Letterman arrives at the Kennedy Center for the Performing Arts for the 20th Annual Mark Twain Prize for American Humor presented to him on Sunday.
Owen Sweeney/Owen Sweeney/Invision/AP
Conan O'Brien in 2016. He is being sued by a writer who accuses him of stealing jokes. O'Brien says the idea of stealing someone else's comedy makes him physically ill.
Tim Mosenfelder/Getty Images
Groundlings comedy troupe founder Gary Austin has died at 75. Here he attends a January 2016 Groundlings event with actress Victoria Carrol-Bell in West Hollywood, Calif.
Araya Diaz/Getty Images for The Groundlings
Comedian Irwin Corey was known for his long-running act as "The World's Foremost Authority." He is pictured here in the 1970s. Corey died at the age of 102.
ABC/Michael Ochs Archives/Getty Images
Corey Ryan Forrester, Drew Morgan and Trae Crowder write and perform together. They wrote a book called The Liberal Redneck Manifesto, which challenges what readers might expect from Southern comedy.
Robin Marchant/Getty Images
Kevin Hart was the most successful comedian last year. He's seen here speaking at the official convention of the National Association of Theatre Owners in Las Vegas.
Alberto E. Rodriguez/Getty Images for CinemaCon
Pakistani stand-up comedy pioneer Saad Haroon tests cultural sensitivities between his native country and India in his material. "When it comes to satire, I think as a culture, we kind of struggle with it," he says.