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 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 premiered at the Telluride Film Festival on August 29, 2013.