Silvio Calabi was an editor of sporting magazines for 30 years. He is a Knight of the International Order of St. Hubertus, a member of Safari Club International and the Namibian Professional Hunting Association, and a director of the California Side By Side Society. With Roger Sanger, he co-founded the Gold Medal Concours d'Elegance of Fine Guns. He is the co-author, with Sanger and Helsley, of the critically acclaimed book Hemingway's Guns. From his home on the Maine coast, Calabi travels and hunts widely. Steve Helsley, of El Dorado Hills, California, is a retired law-enforcement executive, a consultant to the National Rifle Association, a technical adviser to the Association of Firearm and Tool Mark Examiners, a firearms collector, historian and photographer, and a widely published authority on vintage and tactical guns. He has collaborated with Sanger and Calabi on many articles for shooting magazines as well as the critically acclaimed book Hemingway's Guns. Roger G. Sanger founded the California Side By Side Society and served as its President for many years. In 2001, with Silvio Calabi, he co-founded the Gold Medal Concours d'Elegance of Fine Guns and then, with Steve Helsley, the Western Side By Side Championships. Sanger is a Knight of the International Order of St. Hubertus and a co-author, with Calabi and Helsley, of the critically acclaimed book Hemingway's Guns. He lives in Carmel, California, and Sun Valley, Idaho.