Who is John Frankenheimer from Flashback: A Brief History of Film and what is their importance?

John Frankenheimer was a television director in New York during the 1950s. During the 1960s, he moved to film. Frankenheimer worked with a variety of themes and genres, and he had an instinct for directing techniques that heightened performances in literary works. Frankenheimer was most often drawn to films that were pessimistic.