Karl William Marcus (formerly Söderström) (12 January 1917 Liverpool, England – 10 October 1989 Espoo, Finland) was a Finnish-British film director, actor, screenwriter, and producer who used the stage name William Markus.

[1][2] Marcus was born in Liverpool, England, to a Finnish father, Captain, Lieutenant Commander Karl Ilmari Söderström and an English mother May Isabel Blance Cope.

[1] His acting career started in 1944, and he changed his surname from Söderström to Marcus.

[1][4] Traveler's Oases (1953) is a short film directed and starred by Marcus.

[5] The story tells of a Finnish family, which lives in the United States of America.