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Jay Diehl

Associate Professor of History

B.A., Illinois Wesleyan UniversityM.A., University of ChicagoPh.D., New York University


Jay Diehl received his Ph.D in medieval European history from New York University and joined the faculty at Long Island University in 2011. His teaching at LIU covers a wide range of topics in medieval and early modern culture, including the history of emotions, education, and religion. He was a Visiting Foreign Researcher at Ghent University in the summer of 2013 and a Mellon Fellow and Visiting Professor at the Medieval Institute of Notre Dame University in 2014-15.


Prof. Diehl’s research focuses on monastic intellectual culture, manuscript studies, and church reform in northern Europe during the eleventh and twelfth centuries, particularly in the diocese of Liège. He is especially interested in the history of the written word, scriptural exegesis, hagiography, and the liturgy. His current book project is the first complete study of the manuscripts of St.-Laurent, an important monastery in Liège. It examines the ways in which the intersection of writing and community shaped the transformation of monastic learning in the twelfth century.


"Origen's Story: Heresy, Brook Production, and Monastic Reform at St.-Laurent de Liège," Speculum (forthcoming, 2020)

“Truth as Teaching: Lying and the Ethics of Learning in Twelfth-Century Monastic Culture,"in Horizontal Learning in the High Middle Ages: Peer-to-Peer Knowledge Transfer in Religious Communities, eds. Micol Long, Tjamke Snijders, and Steven Vanderputten (Amsterdam, 2019), 81-109.

Medieval Liège at the Crossroads of Europe: Monastic Society and Culture, 1000-1300, eds. Steven Vanderputten, Tjamke Snijders, and Jay Diehl (Turnhout, Brepols, 2017).

“Masters and Schools at St.-Laurent: Rupert of Deutz and the Scholastic Culture of a Liègeois Monastery,” in Medieval Liège at the Crossroads of Europe: Monastic Society and Culture, 1000-1300, eds. Steven Vanderputten, Tjamke Snijders, and Jay Diehl (Turnhout, Brepols, 2017), 151-82.

 “Cluniac Customs Beyond Cluny: Patterns of Use in the Southern Low Countries,” with Steven Vanderputten (co-author), Journal of Religious History 41 (2017): 22-41.

 “The Saint, the Voice, and the Author: Imagining Textual Authority and Personal Presence at Durham Cathedral Priory, c.1080-1150,” Viator 47 (2016): 101-128.

“The Grace of Learning: Visions, Education, and Rupert of Deutz’s View of Twelfth-Century Intellectual Culture,” Journal of Medieval History 39 (2013): 20-47.

“Harmony Between Word and World: Anselm of Canterbury, Aelred of Rievaulx, and Approaches to Language in Twelfth-Century Monasticism,” in Saint Anselm of Canterbury and His Legacy, eds. Giles Gasper and Ian Logan(Toronto and Durham: Pontifical Institute, 2012), 95-113.


Medieval Fellow, Center for Medieval Studies, Fordham University (2018-2019) 

Andrew W. Mellon Postdoctoral Fellow and Visiting Professor of Medieval Studies, Medieval Institute, University of Notre Dame (2014-15)

Bijzonder Onderzoeksfonds/Special Research Fund – Verblijf Buitenlandse Onderzoecker/Visiting Foreign Research Award, Ghent University (June 2013)

Research Fellow, The Humanities Initiative, New York University (2009-2010)

Heckman Fellowship, Hill Museum and Monastic Library (August 2006)