Gary Fields has worked as a letterer on several comic books for Marvel and Dark Horse. As an artist, he has worked on the Rugrats newspaper comic, Teenage Mutant Ninja Turtles at Archie comics and DC's Dexter's Laboratory, Scooby Doo and Cartoon Network Presents. For Marvel, he has done artwork on What If? and Rocko's Modern Life. In the 1980s, he drew Threat! at Fantagraphics.