[1] He had worked with over 200 actors[6] 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.

[citation needed] The final film he was working on at the time of his death was The Batman,[10] which was dedicated to him.

[11] Jack's widow Gabrielle Rogers is also a voice, accent and dialect coach who first started working in the film, television and theatre industries as an actor in the 1980s.

[2] His wife Gabrielle Rogers wrote on Twitter:[12][2] "We lost a man today.