Subversive Virtue: Asceticism and Authority in the Second-Century Pagan World.  University Park: Pennsylvania State University Press, 1995.
Early Monastic Rules: The Rules of the Fathers and the Regula Orientalis. Collegeville: Liturgical Press, 1982.  (Co-translator)
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"Classical Conceptions of Visuality and Representation in John of Damascus’ Defense of Holy Images," Studies in Late Antiquity 4 (2020): 284-308.“
“Seeing God(s): Images and the Divine in Pagan and Christian Thought in the Second to Fourth Centuries C.E.”  Studia Patristica 59 (2013): 5-10.
“Late Antique Visuality: Blurring the Boundaries Between Word and Image, Pagan and Christian.” In David Brakke, Deborah Deliyannis, & Edward Watts, eds., Shifting Cultural Frontiers in Late Antiquity, 139-149.  Farnham, Surrey & Burlington VT: Ashgate, 2012.
“Living Images in the Ekphrasis of Homer and Hesiod.” In Papers of the Langford Latin Seminar 15: 113-141.  Prenton: Oxbow Books, 2012.
“Biblical Not Scriptural: Perspectives on Early Christian Art from Contemporary Classical Scholarship.”  Studia Patristica 44 (2010): 3-8.
“Metal Maidens, Achilles’ Shield, and Pandora: The Beginnings of ‘Ekphrasis.’”  American Journal of Philology 130 (2009): 1-23.
“Verbal and Visual Representation: Art and Text, Culture and Power in Late Antiquity.”  In Philip Rousseau, ed., A Companion to Late Antiquity, 285-305. Oxford: Blackwell, 2009.  This volume  has received the Association of American Publishers 2009 PROSE award ("Professional and Scholarly Excellence") for Best Single-Volume Reference in Humanities and Social Sciences.
“Living Icons: Tracing a Motif in Verbal and Visual Representation from the Second to Fourth Centuries, C.E.” American Journal of Philology 124 (2003): 575-600.
“Clement of Alexandria on Signet Rings: Reading an Image at the Dawn of Christian Art” Classical Philology, 98 (2003): 179-183.
“Truthful Fiction: New Questions to Old Answers on Philostratus’s Life of Apollonius.”  American Journal of Philology, 119 (1998): 419-441.