(written from a Production point of view)
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.
Between 1995 and 2000, Duncan worked on three television series; as illustrator on the science fiction series Space: Above and Beyond (1995-1996, starring Lanei Chapman and Tucker Smallwood and with art department staff Scott Herbertson, Geoffrey Mandel, and Joseph A. Hodges), as storyboard artist on the science fiction mystery series The X-Files (1995-2000), and as visual effects supervisor on the science fiction series Dark Skies (1996-1997). During this time he also worked as storyboard artist on the comedy George of the Jungle (1997), as conceptual illustrator on the fantasy drama Jack Frost (1998), and as director on the television science fiction film The Privateers (2000, with Karl Urban, David Jean Thomas, Jack Donner, Ray Proscia, Walter Koenig, Benjamin Lum, Karen Sheperd, associate producer Jasmine Lliteras, and special effects artists Gabriel Körner and Lee Stringer).
The following years he worked as illustrator on the comedies The Princess Diaries and Rock Star (both 2001) and as storyboard artist on the thriller 15 Minutes (2001, with Kelsey Grammer and Avery Brooks), the science fiction action film The One (2001), the thriller Dark Blue (2002), the action comedy Charlie's Angels: Full Throttle (2003), the action film S.W.A.T. (2003), the comedy Fat Albert (2004), the adventure Kingdom of Heaven (2005), the fantasy film The Chronicles of Narnia: The Lion, the Witch and the Wardrobe (2005), the war drama Flyboys (2006), the comedy Garfield: A Tail of Two Kitties (2006), and the comic adaptations Iron Man (2008) and The Incredible Hulk (2008). He also worked as visual effects artist on the short drama The Grand Design (2007, with Steven Klein).
More recently he worked as additional photographer on the horror thriller Exposure (2009), as concept illustrator on the science fiction film G.I. Joe: The Rise of Cobra (2009, with Rachel Nichols), and as storyboard artist on the fantasy film G-Force (2009) and the superhero sequel Iron Man 2 (2010).