Craig W.H. Luther is a former Fulbright Scholar and a retired U.S. Air Force historian. His books include: Barbarossa Unleashed: The German Blitzkrieg through Central Russia to the Gates of Moscow (Schiffer, 2014), and The First Day on the Eastern Front: Germany Invades the Soviet Union, June 22, 1941 (Stackpole, 2018). The latter work was celebrated by the prestigious on-line data base of WW2 books, "Stone & Stone," as one of the seven best books on WW2 published in 2018. Luther lives near Bakersfield, California.

David Stahel teaches at the University of New South Wales and the Australian Defence Force Academy. His books include Operation Barbarossa and Germany's Defeat in the East (Cambridge, 2009), Kiev 1941 (Cambridge, 2012), Operation Typhoon (Cambridge, 2013), The Battle for Moscow (Cambridge, 2015), Joining Hitler Crusade (ed., Cambridge, 2017), Mass Violence in Nazi Occupied Europe (ed. with Alex J. Kay, Bloomington, 2018) and Retreat from Moscow (New York, 2019). Stahel lives in Canberra, Australia.