Career
- Sept. 1972 - July 1973:
- teaching part-time in Classics Department of University College London, and part-time at William Ellis School, London NW5
- Oct. 1973 - April 1975:
- Dyson Junior Research Fellow in Greek Culture, Balliol College, Oxford
- April 1975 - Sept. 1978:
- University Assistant Lecturer in Classics, University of Cambridge
- May 1976 - :
- Fellow of Christ's College, Cambridge
- Oct. 1978 - Sept. 1989:
- University Lecturer in Classics, University of Cambridge
- Oct. 1989 - Sept. 1996:
- Reader in Ancient Philosophy, University of Cambridge
- Oct. 1996 - July 2000:
- Professor of Ancient Philosophy, University of Cambridge
- July 2000 - :
- Laurence Professor of Ancient Philosophy, University of Cambridge