- (2020) Book: "The Big Book of Mars: From Ancient Egypt to The Martian, A Deep-Space Dive into Our Obsession with the Red Planet". Philadelphia: Quirk Books. ISBN 978-1683692096
- (2021) Book: "Chasing Ghosts: A Tour of Our Fascination with Spirits and the Supernatural". Philadelphia: Quirk Books. ISBN 978-1683692775
- (2025) Book: "To The Hilt: A Sword Swallower's History of Sword Swallowing". Arleen: Schiffer Books. Co-author: Dan Meyer. ISBN 978-0764368820
- (2005) Book: "American Sideshow: An Encyclopedia of History's Most Wondrous and Curiously Strange Performers." New York: Tarcher/Penguin ISBN 978-1585424412
- (2023) Book: "We Are Not Alone: The Extraordinary History of UFOs and Aliens Invading Our Hopes, Fears, and Fantasies". Philadelphia: Quirk Books. ISBN 978-1683693352
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