Joining the Jim Henson's Creature Shop in the early 80s, Stephenson became a member of the unique group of artists designers and crafts people working on the ground-breaking film The Dark Crystal. in addition to working as a mechanical designer, he also served as an assistant cable control puppeteer on Dreamchild. Subsequently, in 1985, he became Creative Supervisor and later served as Executive Vice President and CEO of the Creature Shop.[2]