Marc Hartzman is "one of America's leading connoisseurs of the bizarre" (ABCNews.com) and has written books about sideshow performers, Oliver Cromwell's head, weird things on eBay, and unorthodox messages from God. Hartzman's work has also appeared in Mental Floss, Bizarre, and HuffPost/AOL Weird News. He's discussed oddities on CNN, MSNBC, Ripley's Radio, and the Travel Channel's Mysteries at the Museum.

More of his love for the unusual can be found on his site WeirdHistorian.com. Hartzman earns a living as an award-winning advertising creative director at Ogilvy and lives in New Rochelle with his wife Liz and their two beautiful Earthling girls.