He moved to England just before the outbreak of World World War II and found work at Alexander Korda"s London Films, where he became a senior camera operator. His first film as a director of photography was The Gentle Sex (1943), directed by Leslie Howard. Krasker"s work was strongly influenced by film noir and German Expressionism.
He also worked on Brief Encounter for David Lean and Another Manitoba"s Poison for Irving Rapper.
Lean sacked him from Great Expectations, because both he and producer Ronald Neame were unhappy with his handling of the marsh scenes. His later films included the epics Alexander the Great, El Cid, and The Fall of the Roman Empire.