He had worked with over 200 actors[3] including Robert Downey Jr. (in Richard Attenborough's Chaplin, Michael Hoffman's Restoration and Guy Ritchie's Sherlock Holmes), Pierce Brosnan (in GoldenEye, Tomorrow Never Dies and Die Another Day), Cate Blanchett, and Viggo Mortensen. As supervising dialect coach for The Lord of the Rings, he created the Middle-earth accents and taught them, along with Elvish and Black Speech, to the cast of the trilogy.[4] He designed and taught the accents for the Greeks and Trojans in Wolfgang Petersen's Troy.