The Tonight Show is an American late-night talk show currently broadcast from the NBC Studios in Rockefeller Center in New York City.The Tonight Show is the world's longest-running talk show and the longest-running, regularly scheduled entertainment program in the United States. It is the third-longest-running show on NBC, after the news-and-talk shows Today and Meet the Press.Carson is the longest-serving host to date, although he is not the host with the most episodes. The Tonight Show Starring Johnny Carson aired for 30 seasons between October 1962 and May 1992. Leno, however, has the record of having hosted the greatest number of total televised episodes.