Marcus David Maron is an American stand-up comedian, podcaster, writer and actor. In the 1990s and 2000s, Maron was a frequent guest on the Late Show with David Letterman and appeared more than forty times on Late Night with Conan O'Brien, more than any other stand-up comedian. He hosted Comedy Central's Short Attention Span Theater from 1993 to 1994, replacing Jon Stewart.