Magnificence and the Sublime in Medieval Aesthetics, ed. (2010)
Medieval Humanism in Gottfried von Strassburg's Tristan und Isolde (Heidelberg: Winter, 1977)
The Origins of Courtliness: Civilizing Trends and the Formation of Courtly Ideals, 935-1210 (Philadelphia: Univ. of Pennsylvania Press, 1985). (Choice Magazine outstanding book of the year)
The Envy of Angels: Cathedral Schools and European Social Ideals, 950-1200 (Philadelphia: Univ. of Pennsylvania Press, 1994). Awarded Jacques Barzun Prize in Cultural History from American Philosophical Society, 1995.
Ennobling Love: In Search of a Lost Sensibility (Philadelphia: University of Pennsylvania Press, 1999)
2090 For Lang Bldg
Enchantment: On Charisma and the Sublime in the Arts of the West