Ancient Greek and Roman philosophy, especially late ancient commentators on Plato and Aristotle (Neoplatonists); ancient philosophy of language.I study the philosophers of the ancient Graeco-Roman world, especially the vibrant intellectual traditions that emerged around Plato and Aristotle during their lives and later, during the rise and fall of the Roman Empire. I am particularly interested in the practice of philosophical education (paideia) in late antiquity, and the role of philosophy in society. My recent books study the ancient reception of two classic "first books" in philosophy, Aristotle's Categories and Plato's Alcibiades, which respectively trained students in the rudiments of logic and virtue. My current projects include the Ancient Commentators series of translations, which I co-edit with Richard Sorabji, and a cross-disciplinary study of the cognitive and psychological effects of education in philosophy and the liberal arts.
- Aristotle’s Categories in the Early Roman Empire. Oxford University Press, 2015. Review: NDPR and BMCR
- Olympiodorus: Life of Plato and On Plato First Alcibiades 1–9 and Olympiodorus: On Plato First Alcibiades 10–28. Translated with scholarly introduction and notes. Bloomsbury Academic, 2014 and 2016. Review (both volumes): NDPR
- "Ammonius and His School." Brill Handbook of the Ancient Reception of Aristotle. Ed. Andrea Falcon. Leiden: Brill, 2016: 394–414.
- “The Ancient Commentators”. Oxford Handbook of Science and Medicine in the Classical World. Ed. Paul Keyser and John Scarborough. Oxford University Press. Forthcoming 2016.
- “Proclus on the Ethics of Self-Constitution.” Causation and Creation in Late Antiquity. Ed. Anna Marmodoro and Brian D. Prince. Cambridge University Press. 202-219.
- “Universals, Education, and Philosophical Methodology in Later Neoplatonism". Universals in Ancient Philosophy. Ed. Riccardo Chiaradonna and Gabriele Galluzzo. Pisa: Edizioni della Scuola Normale, 2014. 353-380.
- “Pliable Platonism? Olympiodorus and the Profession of Philosophy in Sixth-Century Alexandria”. Plato in the Third Sophistic. Ed. Ryan C. Fowler. De Gruyter, 2014. 73-11.
- "Which ‘Athenodorus’ Commented on Aristotle’s Categories?". Classical Quarterly 63.1. 2013. 199-208.
- “The Early Aristotelian Commentators on the Criterion of Truth," invited lecture, Università degli Studi di Milano (Italy), Conference on Hellenistic and Late Antique Philosophy, June 2015.
- “Themistius on Rhetoric, Philosophy, and Excellence,” invited lecture, University of Oxford, Philosophy and Late Antiquity Seminar, May 2015.
- “Andronicus of Rhodes on Aristotle’s Categories”, invited lecture, Classical Philosophy Conference, Princeton University, December 2014.
- "The Alexandrian Scale of Virtue", invited lecture, "Aristotle Transferred" Conference, Berlin, October 2014.
- “Aristotle & Alexander on Mental States”, invited symposium presenter, American Philosophical Association (Pacific), March 2013.