Assistant Professor, Department of Economics, University of British Columbia, Vancouver, BC, Canada, 1987-92.

Assistant Professor, Department of Economics, University of Western Ontario, London, Ontario, Canada, 1992-5.

Associate Professor, Department of Economics, University of Western Ontario, London, Ontario, Canada, 1995-6.

Associate Professor, Department of Economics, University of Iowa, Iowa City, Iowa, USA, 1996-2001.

Professor, Department of Economics, University of Iowa, Iowa City, Iowa, USA, 2001-8.

Chair, Department of Economics, University of Melbourne, Melbourne, Victoria, Australia, 2008 to present.