Anställningar (urval)
Professor i europeisk integrationsrätt, Stockholms universitet, 1989 – 2022
Professor i civilrätt, Stockholms universitet, 1975 – 1989 (från 1980 Professor i civilrätt, särskilt konsument och marknadsrätt, 1970 – 1975 docent och biträdande professor vid samma universitet)
Director, The Oxford/Stockholm Söderberg Venture in European Law, Institute of European and Comparative Law, University of Oxford, 2013 – 2022
Director, The Oxford/Stockholm Wallenberg Venture in European Law, Institute of European and Comparative Law, University of Oxford, 2001 – 2013
Fellow, Institute of European and Comparative Law, University of Oxford
Senior Associate Fellow, St Hilda´s College, Oxford, 2009 – 2022
Senior Associate Fellow, Pembroke College, University of Oxford, 2004 – 2009
Senior Research Fellow, Balliol College, University of Oxford, 2001 – 2004
Visiting Professor, King´s College School of Law, University of London, 2001 – 2005
Docent, Åbo Akademi, Finland 1989 – 2022
Gästprofessor i europarätt, Örebro universitet, 2002 – 2007
Visiting Professor, Riga Graduate School of Law (RGSL), Riga, Lettland, 2000 – 2004
Svea hovrätt, Stockholm, 1964 – 1970