April 1986 - March 1992:

co-editor, The Classical Quarterly

1992 - :

co-editor, Cambridge Classical Texts and Commentaries (Cambridge University Press)


ancient philosophy section editor for The Routledge Encyclopedia of Philosophy (London 1998; General Editor Edward Craig), and for updated and enlarged on-line version (2002)

1995 - :

member of the Comitato scientifico e redattivo del Corpus dei papiri filosofici greci e latini (Florence)

1998-2007 :

editor, Oxford Studies in Ancient Philosophy (Oxford University Press), vols 18-34


co-editor, Cambridge Classical Studies (Cambridge University Press)

2011- :

ancient philosophy advisor, Oxford Bibliographies (Oxford University Press)