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 | Duke University |
He held guest professorships at numerous universities, including at Columbia University, St. Catherine's and Nuffield Colleges at the University of Oxford, the Free University of Berlin, the University of Constance, Hebrew University in Jerusalem, and the University of Heidelberg.