Kelly DeVries holds a PhD from the Centre for Medieval Studies at the University of Toronto. He is professor of history at Loyola University Maryland and has most recently written Medieval Weapons: An Illustrated History of their Impact (2007) and The Artillery of the Dukes of Burgundy, 1363-1477 (2006), both with Robert Douglas Smith. His other books include - Medieval Military Technology (1992); Infantry Warfare in the Early Fourteenth Century: Discipline, Tactics and Technology (1996); The Norwegian Invasion of England in 1066 (1999); Joan of Arc- A Military Leader (1999); A Cumulative Bibliography of Medieval Military History and Technology (2002; updated 2005); and Guns and Men in Medieval Europe, 1200-1500: Studies in Military History and Technology (2002), as well as several edited works. In addition he is the author of more than 60 articles on military history and the history of military technology. He currently edits the Journal of Medieval Military History and is the series editor for the History of Warfare series of Brill Publishing.