The Big Bang Theory is an American television sitcom created by Chuck Lorre and Bill Prady, both of whom serve as executive producers on the series, along with Steven Molaro. All three also serve as head writers. The show premiered on CBS on September 24, 2007. In March 2017, the series was renewed for two additional seasons, bringing its total to twelve, and running through the 2018–19 television season. The eleventh season premiered on September 25, 2017.