Fritz Lang was an Austrian-American film director, screenwriter and film producer. Working first in Berlin during the silent-film era of the 1920s and later in Hollywood, Lang explored the darker side of human nature through his cinema. Thea Von Harbou was married to director Fritz Lang and wrote the screenplay for M as well as his most celebrated film Metropolis. In 1932, a year before Adolf Hitler came to power, she joined the Nazi Party, which presumably led to her divorce from Lang, who left Germany in 1934 for Paris. Harbou died in Berlin in 1954.