He specializes in French medieval drama and has written articles on Miracles de Nostre Dame par Personnages and Le Jeu d'Adam, as well as collaborative articles with Claire Sponsler on Le Mystère de la Sainte Hostie and cross-dressing, and with Pamela Sheingorn on the illuminated manuscripts of Gréban's Mystère de la Passion. His ongoing projects include a critical edition of the Mystère de la Sainte Hostie; collected papers of C. Clifford Flanigan and others; and another collaborative project with Pamela Sheingorn on illuminated medieval drama manuscripts.