- Extraordinary Research Fellow, All Souls College (from 2005 to 2021)
- Wellcome Trust Research Lecturer, then Reader, Royal Holloway, University of London (from 1995 to 2007)
- Fifty-Pound Fellow, All Souls College (from 1985 to 2005)
- Prize Fellow, All Souls College (from 1977 to 1984)
- Undergraduate, Christ Church, Oxford (from 1974 to 1977)
- History of medieval medicine and charity
- History of the Mediterranean environment
- History of All Souls College
- (ed. with Sharon Kinoshita), A Companion to Mediterranean History (Oxford: Wiley-Blackwell, 2014).
- (ed. with Elisabeth Hsu), The Body in Balance: Humoral Medicines in Practice (Oxford: Berghahn, 2013).
- (ed. with S. J. D. Green), All Souls and the Wider World: Statesmen, Scholars, and Adventurers, c.1850-1950 (Oxford: Oxford University Press, 2011).
- Hospitals and Healing from Antiquity to the Later Middle Ages (Aldershot: Ashgate, 2008).
- (ed. with S. J. D. Green), All Souls under the Ancien Régime: Politics, Learning and the Arts c. 1650-1850 (Oxford: Oxford University Press, 2007).
- (ed.), Freedom of Movement in the Middle Ages (Donington: Shaun Tyas, 2007).
- (ed. with John Henderson and Alessandro Pastore), The Impact of Hospitals 300–2000 (Oxford: Peter Lang, 2007).
- Co-author with Nicholas Purcell, The Corrupting Sea: A Study of Mediterranean History (Oxford: Blackwell, 2000).
- (ed.), Music as Medicine: The History of Music Therapy since Antiquity (Aldershot: Ashgate, 2000).
