- Quondam Fellow, All Souls College (from 2003)
- Post-Doctoral Research Fellow, All Souls College (from 2000 to 2003)
- Prize Fellow, All Souls College (from 1994 to 2000)
- Greek literature from Homer into late antiquity, especially Hellenistic and imperial
- Religions, art and archaeology of the Roman Near East
- Oracular literature
- Greek textual criticism and palaeography
- Dionysius Periegetes: Description of the Known World (Oxford, 2014)
- ‘The Apology of Pseudo-Meliton’, SEL 24 (2007), 59–110
- The Sibylline Oracles: With Introduction, Text, and Commentary on the First and Second Books (New York: OUP, 2007)
- (Ed. with Introduction, Translation, and Commentary), Lucian, On the Syrian Goddess (New York: OUP, 2003)
- (Edited with an introduction and commentary) Parthenius of Nicaea (New York: OUP, 1999), 607 pp