Chandler was an American novelist who had an immense impact on the detective genre. His well-plotted and brutally realistic novels, among them The Big Sleep, depict the seedy lowlife of Los Angeles and feature Philip Marlowe, a hard-boiled yet honorable private detective who became the prototype for the tough-guy private eye of many subsequent American detective novels. Before beginning his fiction writing career in the 1930s, Chandler held an executive position in what industry? Discuss