Brown created Ninja April O'Neil in a 1985 pin-up published in the fourth printing of Teenage Mutant Ninja Turtles #1. He would later bring his interpretation of the character to the Teenage Mutant Ninja Turtles Adventures title published by Archie Comics. Brown began inking the Teenage Mutant Ninja Turtles title in 1985 and continued until 1988, when he and partner Steve Lavigne began producing artwork for licensed TMNT products. Brown worked primarily as inker over Lavigne's pencils. In 1986 Brown and writer Doug Brammer published two issues of Rion 2990, a proposed four-issue limited series which was a tribute to Japanese comics. As such, it was one of the first examples of Original English-language manga. As a Mirage Studios staff artist, Brown designed the Teenage Mutant Ninja Turtles action figureFarmer Mike for Playmates Toys. According to credits included on the back of turtles action figures, Brown also created Hothead, Scratch, Monty Moose, King Lionheart, Halfcourt, Wyrm, Scumbug, Leatherhead, Doctor El, Wingnut, Ray Fillet, Sandstorm, Mondo Gecko and Rock'N Roll Mondo Gecko. Scratch and Farmer Mike are un-credited on the back of the toy packaging, but Brown has confirmed at different convention appearances that he did create the cat burglar as well as designed Farmer Mike. Brown's comic book seriesThe Selected is populated with his old unused TMNT toy designs. In the late 1980s, Brown, with partner Stephen Murphy, created the Archie Teenage Mutant Ninja Turtles Adventures universe for Mirage Studios. The team of Brown and Murphy created the Mighty Mutanimals as a spin-off of the Adventures title. Brown inked over 80 covers for the Archie TMNT Adventures title. His character Motorhead appeared in an issue of Teenage Mutant Ninja Turtles Magazine. Brown created his concept the Hallowieners in 1984. Mirage Studios published a comic book about the giant mutant monster Halloween hot dogs in 1989. Brown was a participant in the drafting of the Creator's Bill of Rights in 1988. Brown also created the ABCSaturday morninganimated television seriesWild West C.O.W.-Boys of Moo Mesa, and helped with development on its corresponding video game for the arcade by Konami. The game itself easily compared to Konami's own Western game Sunset Riders. From 1995 to 2000, Brown's character Bog Swamp Demon appeared in a number of titles: first with Teenage Mutant Ninja Turtles vol. 2, then in a limited series published by Hall of Heroes, and later comics published by Image Comics and Numbskull Press. Also, near the years of 2011-2013, word has been said that Brown was to create a comic book series that was to be "The Next Generation of the Mutanimals" also known as "The SELECTED". Brown appears in the 2014 documentary film, , from Paramount Pictures.
