From 1948 to 1976 Böhm acted in about 45 films and also in theatre. With Romy Schneider, he starred in Sissi (1955), the first of a film trilogy, as Emperor Franz Joseph, with Schneider as his wife, Empress Elisabeth of Austria. The role for a time limited him to one specific genre as an actor, but Böhm's best known English language film was a dramatic change of image. In Peeping Tom (1960) he played the psychopath Mark Lewis. Director Michael Powell cast him in the role because he felt Böhm might understand the character's experience of having an overbearing father. The film's initial rejection hurt both the actor and Powell, for Powell professionally as well as emotionally, but it is now regarded as a classic. One unusual aspect of the casting is that Böhm displayed a significant German accent throughout the movie, though the character had been born and raised in England to, probably, an English father, as played for short bits by Powell without an accent.