Auteur Theory suggests that the director's personal style, vision, and techniques are reflected in all of their films. This allows audiences to recognize a director's films based on recurring themes and techniques. Alfred Hitchcock is a prime example of an auteur, as his films are renowned for their intelligent plots, witty dialogue, mystery, and murder. Hitchcock revolutionized the thriller genre and was skilled at combining shots in ways that blurred the lines between montage and mise-en-scène techniques. Recurring themes in his work include innocent people getting caught up in circumstances beyond their control.