Friedrich Christian Anton "Fritz" Lang was an Austrian-German-American film director, 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.[3] 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.