Jeff Crisp is a research associate at the Refugee Studies Centre, University of Oxford, and an associate fellow at Chatham House. He has previously held senior positions at the Office of the United Nations High Commissioner for Refugees (UNHCR) and the Global Commission on International Migration. He is also a respected historian who has written widely on African labour history and current affairs.Gavin Hilson is a leading global authority on the environmental and social impacts of the small-scale mining sector and has published over a hundred journal articles, book chapters and reports on the subject. He is currently professor and chair of sustainability in business at the University of Sussex.