Robert K. DeArment (1925–2021) was a University of Toledo, Ohio, graduate whose research and writing focused on nineteenth-century American history, especially outlaws and law enforcement in the frontier West. He is the author of Bat Masterson: The Man and the Legend and the three-volume Deadly Dozen: Forgotten Gunfighters of the Old West.
Joseph G. Rosa, (1932–2015), is the author of the definitive biography of Wild Bill Hickok, They Called Him Wild Bill: The Life and Adventures of James Butler Hickok, as well as The Gunfighter: Man or Myth? And (with Waldo E. Koop) Rowdy Joe Lowe: Gambler with a Gun, all published by the University of Oklahoma Press.