S. T. Joshi is a freelance writer, scholar, and editor whose previous books include Documents of American Prejudice; In Her Place: A Documentary History of Prejudice against Women; God's Defenders: What They Believe and Why They Are Wrong; Atheism: A Reader; H. L. Mencken on Religion; The Agnostic Reader; and What Is Man? And Other Irreverent Essays by Mark Twain.
Guillermo del Toro is a Mexican director, producer, screenwriter, novelist, and designer, most famous for his Academy Award-winning film, Pan's Labyrinth, and the Hellboy film franchise. He has received the Nebula, Hugo, and Bram Stoker awards and is an avid collector and student of arcane memorabilia and weird fiction.