Maronie provided numerous articles for Marvel Comics' Planet of the Apes Magazine in the mid-1970s, covering subjects from all aspects of the Planet of the Apes franchise, including the five movies and the TV series. His enthusiasm for the Apes movies even won him a brief supporting role in 1973's Battle for the Planet of the Apes, though his scenes were edited out of the theatrical release and remained unseen for many, many years. He continues to write sci-fi journalism, most notably in Starlog magazine.