Duncan started his career in the '90s and worked as second assistant camera operator on the crime drama Flashback (1990, with assistant camera operator Wayne Baker and camera operator Philippe Carr-Forster), as matte artist and production design consultant on the television revival Knight Rider 2000 (1991, with Don Greenberg), and as second unit director and storyboard artist on the thriller Almost Blue (1992). In 1993 he served as art department coordinator for the historical television drama The Incredible Discovery of Noah's Ark, followed by an occupation as visual effects artist on the television documentary Mysteries of the Ancient World in 1994.