Steven Nickel is a freelance writer who has written for the Cleveland Plain Dealer and has appeared on NBC's Unsolved Mysteries, A&E's Biography, and documentaries on the Discovery Channel and the History Channel. The author of Torso, he lives in Janesville, Wisconsin. William Helmer is a former senior editor at Playboy and author of The Gun that Made the Twenties Roar and Public Enemies, and the co-author of Dillinger: The Untold Story and The Quotable Al Capone. He lives in Iowa