I joined Mirage Studios in 1987 and am considered one of the longest running comic book artists to serve on a single property (the Teenage Mutant Ninja Turtles). In 2009 Viacom took over the ownership of the turtles but I have remained a full-time professional comic book writer and artist.
Besides my TMNT work, I have many self-published comics, including Paleo: Tales of the Late Cretaceous, Dragonfly, A Walk Through Dinosaurland, Hellride, Dinosaur Head Cat and the Box City Wallops.