 Andenæs is a research fellow of the Institute of European and Comparative Law, University of Oxford and a senior research fellow at the Institute of Advanced Legal Studies, University of London.He was visiting professor at University of Paris I (Sorbonne) in 2006 and University of Rome La Sapienza in 2002–2009.In 2002–2003 he held the Chaire W J Ganshof van der Meersch under the Fondation Philippe Wiener–Maurice Anspach at the Université Libre de Bruxelles.