The majority of his published work has involved working as an inker for Marvel Comics and District of Columbia Comics. Riggs" first professional comics work was as a result of winning the "Marvel Try-out Book" in the 1980s for lettering. Prior to that, he had already been working as a graphic artist for several years.
Early work consisted of inking a lot of the Marvel United Kingdom titles during their expansion into the American market, including both Genetix series
His 2008 projects include providing the art for a five-issue "Sir Apropos of Nothing" story written by Peter David and published by IDW Publishing.
Death"s Head II #5, 14 (Marvel United Kingdom, 1993, 1994)
Super Soldiers #8 (Marvel United Kingdom, 1993)
Cyberspace 3000 #6 (Marvel United Kingdom, 1993)
Death Wreck #1 (Marvel United Kingdom, 1994)
X-Men Unlimited #5-7 (Marvel Comics, 1994)
The Incredible Hulk #425-432, 436-446 (Marvel Comics, 1995–1996)
Suicide Squad: Raise the Flag (District of Columbia Comics, 2007–2008)
Tangent: Superman"s Reign #2-5 (District of Columbia Comics, 2008).