Fritz Lang was an Austrian-German-American filmmaker, screenwriter and occasional film producer. One of the best known émigrés from Germany's school of Expressionism, he was dubbed the "Master of Darkness" by the BFI. His most famous films are the groundbreaking Metropolis (the world's most expensive silent film at the time of its release) and M, made before he moved to the United States, where he contributed greatly to film noir.