The Unknown Known (also known as The Unknown Known: The Life and Times of Donald Rumsfeld) is a 2013 American documentary film about the life of former U.S. Secretary of Defense and congressman Donald Rumsfeld, directed by Academy Award winning documentarian and filmmaker Errol Morris. The film is a summary of 33 hours of interviews that Morris conducted with Rumsfeld over eleven separate sessions during visits to Boston, Massachusetts. It is dedicated to the memory of Roger Ebert.