David Stewart Bachrach is a professor of medieval European history at the University of New Hampshire. He specializes in the military and administrative history of the Carolingian and German Empires as well as the kingdom of England in the thirteenth and early fourteenth century. His recent publications include Administration and Organization of War in Thirteenth-Century England (2020), Foundations of Royal Power in Early Medieval Germany: Material Resources and Governmental Administration in a Carolingian Successor State (2022), and Warfare in the Global Middle Ages (2025) with Bernard S. Bachrach.