 Among the best-known examples of the genre are "An Inconvenient Truth", directed by Davis Guggenheim, and "Super Size Me", directed by Morgan Spurlock.Michael Moore is also well known for his authored documentary films, including "Bowling for Columbine", "", "Fahrenheit 9/11", and "Sicko".The format, expanding upon the presenter/author's thesis over a number of episodes was popularized with Kenneth Clark's landmark BBC 2 series Civilisation.