He has held office as Assistant Professor of Roman and Byzantine Law at the University of Athens (1966–8), Fellow and Director of Studies in Law at Trinity College, Cambridge (1974–1986), Lecturer in the Faculty of Law, University of Cambridge (1978–1986), Denning Professor of Comparative Law at Queen Mary and Westfield College, Professor of European Private Law at University College London, Clifford Chance Professor of European Law and Director of the Institute of European and Comparative Law, and Fellow of Lady Margaret Hall, University of Oxford (1995–1999) and Clifford Chance Professor of Comparative Law and Fellow of Brasenose College.