 In 2004, Leno signed a contract extension with NBC which would keep him as host of "The Tonight Show" until 2009.Later in 2004, Conan O'Brien signed a contract with NBC under which O'Brien would become the host of "The Tonight Show" in 2009, replacing Leno at that time.During the 2007–08 Writers Guild of America strike, Leno was accused of violating WGA guidelines by writing his own monologue for "The Tonight Show".