| Organisation | Position | From – To |
| Academic Council for the United Nations System | Executive Director | 2018-2020 |
| Routledge | Editor in Chief of the Non-State Actor in global governance series | 2001 |
| Academic Council of the United Nations System | Member | 2015 – 2020 |
| British Branch of the International Law Association. | Member | 2010- 2020 |
| British International Studies Association. | Int’l Law Working Group Convener | 2012 – 2016 |
| International Law Association. | Non-State Actors Committee Chair | 2007 – 2016 |
| International Association for Critical Realism | Member | 2012 |
| Political Studies Association. | Member | 2010 |
| Terrorism and Political Violence Association | Advisory Board Member | 2011 |
| University and College Union | Member | 2010 |
| Journal of International Law of Peace and Armed Conflict | Editorial Board Member | 2008 |
| Institute for Globalisation, International Economic Law and Dispute Settlement | Executive Director | 2001 – 2005 |
| Security Institute for Governance and Leadership in Africa, Stellenbosch University | Research Fellow | 2016 |
| Human Security Journal | Editorial Board Member | 2014 |