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John Frankenheimer was a film director, producer, and screenwriter who is best known for his work in the action/suspense genre. His films often feature complex plots, dark themes, and high-stakes action sequences. Some of his most notable films include The Manchurian Candidate (1962), Seven Days in May (1964), The Birdman of Alcatraz (1962), and Ronin (1998). Frankenheimer's films have been praised for their suspenseful atmosphere, gripping storytelling, and powerful performances.