David Anderson is Lecturer in African Studies, University of Oxford and Research Fellow, St Cross College, Oxford. Susan Beckerleg is an International Consultant and specializes on the social aspects of illicit substance use. Degol Hailu is a research academic at the School of Oriental and African Studies (SOAS), University of London. He is currently on leave from SOAS and works for the United Nations Development Programme (UNDP) as policy advisor for the Caribbean region. Axel Klein is Lecturer in Addictive Studies at the Kent Institute of Medicine and Health Studies, University of Kent.