National Researcher of Canada and definitive chair position. Professor of law and political science at the Toronto University. In charge of the year opening lectures at the school of law and society in Oxford, 2010 period.

Specialist on comparative Constitutional Law; some of his most important books: Towards Juristocracy: the Origins and Consequences of the New Constitutionalism (Harvard University Press, 2004 y 2007), and he is co-editor (together with Christopher L. Eisgruber). He collaborated in a special number of the International Constitutional Law Review "North American Constitutionalism" and of Constitutional Theocracy (in print) at Harvard University Press.