He is currently on leave from the university to work in the Fiscal Affairs Division of OECD, Paris, in the Unit for Cooperation with Economies in Transition and Non-Member Countries. His work with OECD involves providing advice and training to officials from the governments of emerging market economies in Eastern Europe and Central Asia. He has also worked as a consultant to the IMF and as a member of various advisory committees to the Australian Government and the Australian Taxation Office. He has studied and taught at universities in Australia and the United States and is the author of several books on taxation as well as many articles in Australian and international journals.