The Tonight Show is a long-running American late-night talk and variety show airing on NBC whose current incarnation has been hosted by Jay Leno since 1992. Now in its 54th season[dated info], The Tonight Show is the third longest-running entertainment program in U.S. television history (after the soap opera Guiding Light and Hallmark Hall of Fame).
The Tonight Show can date its origins to a local New York program called Broadway Open House, which started in 1950; its format can be traced to New York show hosted by Steve Allen and which premiered in 1953 on what is now WNBC-TV.
The show was hosted by Steve Allen (1954-57), Jack Paar (1957-62), Johnny Carson (1962-92), and Jay Leno (1992-present). Late Night host Conan O'Brien is scheduled to replace Leno on June 1, 2009. The longest-serving host to date was American comedian Carson, who hosted The Tonight Show Starring Johnny Carson for 29 years.