Dunn was born inΒ Taiwan, and grew up in Taiwan,Β Kentucky, andΒ San Antonio, Texas, where he graduated fromΒ Central Catholic Marianist High School.Β It was in Taiwan that he was first exposed to JapaneseΒ manga.
InΒ 1984Β he co-foundedΒ Antarctic Press,Β an American comic book company specializing in manga-style (Amerimanga) titles. His most notable creations for Antarctic are the comic book seriesΒ Ninja High SchoolΒ andΒ Warrior Nun Areala.