“One night in the early 1960s, car trouble forced author [Donald E.] Westlake to walk across the George Washington Bridge between New Jersey and New York on a winter evening. The wind and the cold and the cars zooming by made him feel very alone and very alienated. He began to wonder what sort of person would belong in that sort of environment.The result was Parker, a professional thief shot and left for dead by his associates and his wife. When he is introduced, at the beginning of The Hunter (1962; British title Point Blank), he’s walking across the George Washington Bridge, planning his revenge.”
Below is a great interview with author Donald E. Westlake on Parker and this book in particular.