Norway | Harvard University | Columbia University | Yale University | University of Paris | New York University | Stanford University | Princeton University | University of Cambridge | University of Pennsylvania | University of Michigan | University of Chicago | University of California, Berkeley | University of Toronto | Cornell University | University of Oxford | University of London | University of Oslo | Cambridge University | University of Southern California | McGill University | Johns Hopkins University | Northwestern University | University of California | Brown University | University of Queensland | University of Minnesota | University of Washington | University of Notre Dame | University College London |
He taught by invitation for extended periods at several universities worldwide, such as University of Pennsylvania, Cambridge University, University of Hull, University College London, Bergen University Norway, University of Hanover Germany, Vienna University of Technology Austria, and has held professorships at Guangdong University of Foreign Studies, Beijing Union University, Victoria University, Australia, Nyenrode Business University.