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Friedrich Christian Anton Lang, known professionally as Fritz Lang, was an Austrian-American film director, screenwriter, and producer. He is widely regarded as one of the most influential figures in the history of cinema. Lang's career spanned six decades, and he directed over 50 films in a variety of genres, including expressionist horror, film noir, and Westerns. His notable works include "Metropolis" (1927), "M" (1931), and "The Big Heat" (1953).