G. Russell Girardin had a successful career as the head of an advertising agency. He died mere months after showing William J. Helmer the long-forgotten manuscript on Dillinger.

William J. Helmer is author of The Gun That Made the Twenties Roar and other books on the gangland era. He lives in Boerne, Texas.

Rick Mattix is author (with William J. Helmer) of Public Enemies: America's Criminal Past, 1919¿1940. He lives in Bussey, Iowa.