While recovering from his injuries and
shell shock in 1916, he wrote some scenarios and ideas for films. He was discharged from the army with the rank of lieutenant in 1918 and did some acting in the Viennese theater circuit for a short time before being hired as a writer at
Decla,
Erich Pommer's
Berlin-based production company.
His writing stint was brief, as Lang soon started to work as a director at the German film studio
Ufa, and later
Nero-Film, just as the
Expressionist movement was building. In this first phase of his career, Lang alternated between
art films such as
Der Müde Tod (Destiny, literally "Tired Death") and populist thrillers such as
Die Spinnen (Spiders), combining popular genres with
Expressionist techniques to create an unprecedented synthesis of popular entertainment with
art cinema. In 1920, he met his future wife, the writer and actress
Thea von Harbou. She and Lang co-wrote the scripts for 1922's
Dr. Mabuse, der Spieler (Dr. Mabuse the Gambler), which ran for four hours in two parts in the original version and was the first in the
Dr. Mabuse trilogy, 1924's
Die Nibelungen, the famed 1927 masterpiece
Metropolis, and the 1931 classic,
M, his first "
talking" picture.
Although some consider Lang's work to be simple
melodrama, he produced a coherent
oeuvre that helped to establish the characteristics of
film noir, with its recurring themes of psychological conflict, paranoia, fate and moral ambiguity. His work influenced filmmakers as disparate as
Jacques Rivette and
William Friedkin.
In
1931, between
Metropolis and
Das Testament des Dr. Mabuse, Lang directed what many film scholars consider to be his masterpiece:
M, a disturbing story of a child murderer (
Peter Lorre in his first starring role) who is hunted down and brought to trial by Berlin's criminal underworld.
M remains a powerful work; it was
remade in
1951 by
Joseph Losey, but this version had little impact on audiences, and has become harder to see than the original film.
Lang epitomized the stereotype of the tyrannical German film director such as
Erich von Stroheim and
Otto Preminger; he was known for being hard to work with. During the climactic final scene in
M, he allegedly threw Peter Lorre down a flight of stairs in order to give more authenticity to Lorre's battered look. He even wore a monocle that added to the stereotype.