- Quondam Fellow, All Souls College (from 2003)
- Reader in Sociology, University of Oxford and Fellow, All Souls College (from 1995 to 2003)
- Lecturer in Sociology (ad hominem Reader (1993) and Fellow, St Anne’s College (from 1991 to 1995)
- Junior, then Senior (1988), Research Fellow, King’s College, Cambridge (from 1984 to 1991)
- Civil Servant, Regional Administration, Piedmont, Italy (from 1978 to 1984)
- Analytical Sociology
- Mafias
- Signalling Theory and Applications
- Trust and Mimicry
- Violent Extremists
- Codes of the Underworld. How Criminals Communicate (Princeton University Press, 2009)
- (with Heather Hamill) Streetwise. How Taxi Drivers Establish Customers’ Trustworthiness (Russell Sage Foundation, 2005)
- (Editor) Making Sense of Suicide Missions (OUP, 2005)
- (with Michael Bacharach) ‘Trust in signs’, in K. Cook (ed.) Trust and Society (Russell Sage Foundation, 2001), pp 148–84
- The Sicilian Mafia. The Business of Private Protection (Harvard University Press, 1993)
- (Editor) Trust. Making and Breaking Cooperative Relations (Oxford: Basil Blackwell, 1988)
- Doctoral students in sociology
