The supernatural always had the allure of forbidden fruit, ever since Robert Herold's mother refused to allow him, as a boy, to watch creature features on late night TV. She caved in. (Well, not literally.)
As a child, fresh snow provided him the opportunity to walk out onto neighbors' lawns halfway and then make paw prints with his fingers as far as he could stretch. He would retrace the paw and boot prints, then fetch the neighbor kids and point out that someone turned into a werewolf on their front lawn. (They were skeptical.)
He has pursued many interests over the years (among them being a history teacher and a musician), but the supernatural always called to him. You could say he was haunted. Finally, following the siren's call, he wrote The Eidola Project, based on a germ of an idea he had as a teenager.
Ultimately, he hopes the book gives you the creeps, and he means that in the best way possible.