Adam Selzer is an author and researcher specializing in the secret side of history, rescuing long-lost stories from microfilm reels, tracing urban legends to their sources and uncovering the criminal underworld. He has been a tour guide in New York and Chicago, and has written over twenty books. Titles include multiple works of crime history, including H. H. Holmes: The True Story of the Devil in the White City, Mysterious Chicago and The Ghosts of Chicago.