There are several Gary Greenbergs. (1) is an attorney, founder of the New York Libertarian party, and an iconoclastic writer on biblical archaeology. He is also the author of "War of the Werewolf." (2) is a comic and co-author of pop-up books, as well as other humorous works. These authors are distinct from the author of "A Grain of Sand", and one or more authors of works on psychology.