John D. Hosler

AUTHOR of multiple books and more than 50 academic articles, essays, and reviews about medieval European and Middle Eastern history, including a 2018 Times Literary Supplement Book of the Year.

SPEAKER for professional and local audiences, large and small, who has given over 60 invited lectures, conference papers, and community talks across America and abroad.

PROFESSOR who teaches military history to field-grade officers at the the U.S. Army's Command and General Staff College (CGSC), with seventeen years of prior experience teaching at traditional universities.

"I have spent my professional life investigating the medieval past and sharing what I've learned with anyone willing to listen."


  • Medieval military history in the British Isles, France, and the Levant

  • Political and religious contexts of medieval military history



  • Crusading warfare

  • Ancient and medieval roots of Middle Eastern conflict

  • Pre-modern military history (supervise graduate theses)


  • Associate Professor of Military History (2017-Present), Command and General Staff College, Fort Leavenworth, Kansas

  • Full (2017), Associate (2010-2017), and Assistant (2005-2010) Professor of History, Morgan State University, Baltimore, Maryland

  • Instructor at Loyola University-Maryland, University of Delaware, and Iowa State University (various)


  • Ph.D., History, University of Delaware

  • M.A., History, Iowa State University

  • M.A., English Literature, Iowa State University

  • B.A, English and History, Iowa State University


  • President, De Re Militari: the Society for Medieval Military History

  • Trustee, United States Commission on Military History

  • Series Co-Editor (with Kathryn Hurlock), War and Conflict in Pre-Modern Societies, ARC Humanities Press

  • Peer reviewer for The Boydell Press, Brill, History CompassJournal of Military History, and Vulcan: the International Journal for the Social History of Military Technology


  • Royal Historical Society

  • De Re Militari

  • Society for Military History

  • United States Commission on Military History

  • Society for the Study of the Crusades and the Latin East

Full CV