De Wolff, who mainly played villainous roles, began his long career in the 1930s, with one of earliest roles being in the film Fire Over England. His television credits included The Adventures of Robin Hood, The Avengers, Maigret, No Hiding Place, Danger Man, The Troubleshooters, The Saint, Paul Temple and Dixon of Dock Green.
Other notable film appearances included Dr Mortimer in The Hound of the Baskervilles, the gypsy leader Vavra in From Russia With Love and Agrippa in Carry On Cleo. He also played the villian Jedikiah on The Tomorrow People.
- Internet Movie Database at the