米国作曲家作詞家出版者協会
De Marco is a member of the American Society of Composers, Authors and Publishers, the Science Fiction and Fantasy Writers of America, the International Association of Media Tie-in Writers, Western Writers of America, the Horror Writers Association, the Science Fiction Poetry Association, the Missouri Writers Guild, the International Order of Horror Professionals, Rocky Mountain Fiction Writers, Northern Colorado Writers, and the American Society of Composers, Authors and Publishers.