The Unknown Known (also known as The Unknown Known: The Life and Times of Donald Rumsfeld) is a 2013 American documentary film about the political career 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 Newton, Massachusetts. The film was released on April 4, 2014, by Radius-TWC and is dedicated to the memory of Roger Ebert.