Dan Harms is a librarian and author whose interests include Lovecraft, the Cthulhu Mythos, grimoires, the history of magic, and rôleplaying games. His books include The Necronomicon Files(1998, with John Wisdom Gonce III),The Cthulhu Mythos Encyclopedia (2008), The Book of Oberon (with James Clark and Joseph Peterson) (2015) and Of Angels, Demons, and Spirits (with James Clark) (2019). His articles have appeared in Fortean Times, The Journal for the Academic Study of Magic, The Journal of Scholarly Publishing, Paranoia, Imelod, Le Bulletin de l’Université de Miskatonic, Worlds of Cthulhu, Cthuloide Welten, and The Unspeakable Oath.