Photos: Jon Stewart through the years

Through the years ALPINE VALLEY, WI - JUNE 13: (FILE PHOTO) Jon Stewart sits during a press conference at the Tibetan Freedom Concert June 13, 1999 in Alpine Valley, Wisconsin. Stewart, host of the Comedy Central show "The Daily Show", signed a deal with NBC to develop, co-write and act as executive producer for a sitcom for fall 2003. (Photo Frank Micelotta/ImageDirect) (Frank Micelotta/Getty Images)