Do a search for his name onwww.amazon.com and you'll find his books!
Alan Moore is a Post-Modernist-there can be no doubt.
PoMo (Post-Modernism) was first defined in a 1942 issue of the Architectural Digest as a mixture of Classical Realism and Abstract Modernism. There have been many arguments in the ensuing 58 years as to whether this architectural usage of the term applies to literature, music, and the visual arts as well. Whatever the definition, it is certain that there are many schools of PoMo. And Moore fits into several of them.