Professor at the University of Oslo and a member of the ICSID Panel of Arbitrators. UN President-Rapporteur on Arbitrary Detention 2009-2015, Director of the British Institute of International and Comparative Law 1999-2006, and the Centre of European Law at King’s College, University of London 1991-1999. General Editor of the International and Comparative Law Quarterly 2000-2006 and from 1996, of European Business Law Review.
Honorary Director of Studies, IALS 1992, Senior Research Fellow in Corporate and Commercial Law IALS 1996-7, Senior Research Fellow IALS 1997-2021, 2004-2019 also Director of the Centre for Commercial and Financial Law.
Barrister, England and Wales, and Advokat, Norway. Bencher of the Inner Temple from 2002.
The Lord Chancellor's recommendation when he in 2019 was appointed honorary Queen’s Counsel: ‘A stellar academic recommended for his work in comparative and international law, in familiarising academic and practising lawyers and the judiciary in this jurisdiction with other systems of law and by encouraging exchanges of views and approaches between common and civil lawyers.’
Chevalier of the Légion d’honneur in 2009, and commendatore of the Ordine al merito della Repubblica Italiana in 2008 and grande ufficiale in 2019.