Chan entered the American comics industry in 1972 with DC Comics as a penciler on horror/mystery titles such as "Ghosts", "House of Mystery", and "The Unexpected". By 1974, he was working regularly for Marvel Comics on "Conan the Barbarian". From 1975–1976, Chan worked exclusively for DC including the artwork for "Claw the Unconquered" which was written by David Michelinie. While working on the "Detective Comics" series, he drew the first appearances of Captain Stingaree in issue #460 (June 1976) and the Black Spider in #463 (Sept. 1976). Under the name Chua, he was DC Comics' primary cover artist from approximately 1975 to 1977.