Thormann is known for his firm, clear delivery and has dubbed distinguished actors, besides Caine and O'Toole, such as John Hurt, Jean Rochefort, Ian McKellen in the X-Men movies, Max Von Sydow, and Edward Fox. He dubbed Vincent Price in Twice Told Tales and some redubs, Paul Scofield in The Crucible, James Fox in The Remains of the Day, John Standing in The Elephant Man, James Earl Jones in The Last Remake of Beau Geste, Peter Sellers in Being There, and Paul Benedict in The Freshman.