German director and screenwriter.

He started working in film in 1925 as a translator of silent films. He worked as an editor and assistant director, and in 1929 he directed his first film Sunday People with Edgar G. Ulmer. Other collaborators on this film are Fred Zinnemann, Billy Wilder and Robert's brother Kurt Siodmak, all of whom later became Hollywood directors and screenwriters.

After Hitler came to power, Siodmak emigrated to France, where he made several unnoticed films.

In 1939 he arrived in the USA and directed noir films such as The Suspect (1944), The Strange Affair of Uncle Harry (1944), The Spiral Staircase (1945), The Dark Mirror (1946) and the most acclaimed The Killers (1944) .

He also shot Cry of the City (1948), Criss Cross (1949), The File on Thelma Jordon (1950), Deported (1950), The Whistle at Eaton Falls (1951) and The Crimson Pirate (1952), after which he returned to Europe. He continued to make films until 1969, but most of them were only average.