Jessalynn L. Bird is Associate Professor of Humanistic Studies at Saint Mary's College, Notre Dame, USA, and a Regional Fellow of the Medieval Institute. She has published widely on the crusades, medieval heresy, and the activities of individuals trained in Paris as preachers, reformers, and judges delegate. She is co-editor, with Edward Peters and the late James Powell, of Crusade and Christendom: Annotated Documents in Translation, Innocent III to the Fall of Acre, 1187-1291; with G.E.M. Lippiatt, Crusading Europe: Essays in Honour of Christopher J. Tyerman (2019); with Damian Smith, The Fourth Lateran Council and the Crusade Movement: The Impact of Fourth Lateran (1215) on Latin Christendom and the East (2018); and sole editor of The Papacy, Crusade, and Christian-Muslim Relations: Essays in Memory of James M. Powell (2018).

Elizabeth Lapina is Professor of Medieval History at the University of Wisconsin-Madison, USA. She is a co-editor of three volumes: Games and Visual Culture in the Middle Ages and the Renaissance, co-edited with Vanina Kopp (2020); The Uses of the Bible in Crusader Sources, co-edited with Nicholas Morton (2017); The Crusades and Visual Culture, co-edited with April Morris, Susanna Throop and Laura Whatley (2015). She is the author of one monograph (Warfare and the Miraculous in the Chronicles of the First Crusade (2015) and a number of articles.