| 2011 – present |
Head of School, The Queen’s University Management School of Belfast, UK. |
| 2008 – present |
Professor of Economics, The Queen’s University Management School of Belfast, UK. |
| 2005 – 2009 |
Professor, Department of Economics, Virginia Tech, Blacksburg, VA. |
| Spring 2006 |
Visiting Professor, Department of Econometrics, Vrije Universiteit, Amsterdam, The Netherlands. |
| 1997 – 2005 |
Associate Professor, Department of Economics, Virginia Tech, Blacksburg, VA. |
| Spring 1999 |
Visiting Professor, Center for Economic Research, Tilburg University, Tilburg, The Netherlands. |
| 1991 – 1997 |
Assistant Professor, Department of Economics, Virginia Tech, Blacksburg, VA. |
| 1990 – 1991 |
Assistant Professor, Department of Econometrics, Tilburg University, Tilburg, The Netherlands. |
| 1986 – 1990 |
Project Researcher, The Netherlands Organization for Scientific Research (NWO) at Department of Econometrics, Tilburg University, Tilburg, The Netherlands. |