- Professor of Law at Aberystwyth since 1999
- Previously taught at the Universities of Glasgow, Durham and Tasmania.
- Alexander-Von-Humboldt Research Fellow, Max-Planck-Institut für aus. öff. Recht und Völkerrecht, Heidelberg (1991, 1992).
- Dean, Faculty of Law, University of Tasmania (1996-1998).
- DAAD Visiting Research Fellow, Ernst-Moritz-Arndt Universität Greifswald (1997).
- Alexander-Von-Humboldt Research Fellow, Ernst-Moritz-Arndt Universität Greifswald (1999).
- Visiting Professor in European and International Law, University of Tasmania (2001).
- Parsons Fellow, University of Sydney (2003).
- Visiting Professor in International Law, University of Adelaide (2007).
- Visiting Professor in Migration and Refugee Law, Viadrina University, Frankfurt (Oder) (2008).
- Visiting Professor in International Law, Masaryk University, Brno (2008).
Consultant to several international organisations and states on people trafficking and refugee law.
Guest lecturer on IHL for the International Committee of the Red Cross and Polish Red Cross, (International Humanitarian Law Summer School, Warsaw), as well as the Red Cross Societies of Romania, Lithuania, Latvia, Estonia and Germany.
Guest lectures and papers at many universities and institutions in the UK, Germany, Poland, Czech Republic, Uzbekistan, Romania, Malta, Lithuania, Latvia, Estonia, Australia, Russia, Turkey, Hungary, Norway, Moldova, Switzerland, Italy, Netherlands, Belgium, Macedonia, USA, Slovenia, Israel, Sweden, Luxembourg, Greece, New Zealand, Taiwan, Austria, Spain, Finland, Qatar and South Africa.
Member, Council of Europe's Group of Experts on Action against Trafficking in Human Beings since 2013.
Member, European Commission Group of Experts on Trafficking in Human Beings since 2008; reappointed 2011.
Participated in the UNHCR's Global Consultations Programme as a nominee of the Australian Government (2001).
Judge at the Martens International Humanitarian Law Moot, Tashkent 2002 and Moscow 2004, ICRC International Humanitarian Law Moot, Budapest 2004 and 2005 and Ljubljana 2006, Moldova 2005, Pictet Moot - Vrnacka Banja 2006, ICRC - Israel 2007, ICRC - Sarajevo 2010, 2011, 2012.
Editor and principal contributor of International Focus (Australian Law Journal).
Member, Editorial Board, Australian Year Book of International Law.
Book Reviews Editor, International Journal of Refugee Law.
Member, Editorial Advisory Boards, Acta Societais Martensis (Estonia) and Silesian Journal of Legal Studies (Poland).
ESRC Peer Reviewer
World record holder, Berlin Marathon (in category).
International Law, International Humanitarian Law, Nationality, Refugee Law, Trafficking and Smuggling of Human Beings.
All areas of International Law but particularly Refugee Law, People Trafficking, International Humanitarian Law, International Criminal Law, Law and Gender, Torts