Jay Diehl

Jay Diehl is an Associate Professor of History at Long Island University, affiliated with the College of Liberal Arts and Sciences. He holds a Ph.D. in medieval European history from New York University and has been a member of the LIU faculty since 2011. His academic work bridges teaching and research in medieval culture, religion, and education.

Education:

• B.A., Illinois Wesleyan University
• M.A., University of Chicago
• Ph.D., New York University

Prof. Diehl's research centers on monastic intellectual life in northern Europe during the 11th and 12th centuries, especially in the diocese of Liège. His specialties include manuscript studies, church reform, scriptural exegesis, hagiography, and the liturgy. He investigates how writing and communal identity shaped monastic learning, with a current book project on the manuscripts of St.-Laurent de Liège.

His recent publications span journals like Speculum, Viator, and Journal of Medieval History, as well as edited volumes on medieval Liège and horizontal learning in religious communities. The articles collectively emphasize themes of textual authority, educational ethics, intellectual networks, and the interplay between spiritual experience and scholarly practice in medieval monasticism.

Scientific Awards and Fellowships:

• Medieval Fellow, Center for Medieval Studies, Fordham University (2018–2019)
• Andrew W. Mellon Postdoctoral Fellow and Visiting Professor, Medieval Institute, University of Notre Dame (2014–15)
• Visiting Foreign Research Award, Ghent University (2013)
• Research Fellow, The Humanities Initiative, NYU (2009–2010)
• Heckman Fellowship, Hill Museum and Monastic Library (2006)

While no formal advisees are listed, Prof. Diehl has engaged in significant collaborative research and editorial projects. He has received competitive fellowships and research grants supporting travel, archival work, and publication. His scholarly contributions reflect sustained engagement with primary sources and interdisciplinary methodologies in medieval studies.

He is involved in international academic networks, having conducted research at institutions in Belgium and the United States. His work contributes to broader understandings of how knowledge was produced, transmitted, and transformed within religious communities during the High Middle Ages.