David Satterthwaite is a Senior Fellow at the International Institute for Environment and Development (IIED) and Editor of the international journal Environment and Urbanization. A development planner by training with a Doctorate in social policy, he has long had an interest in the power and capacity of grassroots organizations formed by residents of informal settlements; this was the focus of a book written with Jorge Hardoy in 1989 entitled Squatter Citizen. More recent books published by Earthscan include: The Earthscan Reader on Sustainable Cities (editor), 1999; Environmental Problems in an Urbanizing World (with Jorge Hardoy and Diana Mitlin), 2001; Empowering Squatter Citizen (co-editor with Diana Mitlin), 2004 and Adapting Cities to Climate Change (co-editor with Jane Bicknell and David Dodman), 2009. Most of his work since 1979 has been in research, working with collaborating institutions in Africa, Asia and Latin America, mainly on issues of urban poverty, housing, health, environment, urban development and rural-urban linkages. This includes a particular interest in what causes and underpins the vulnerabilities of low-income groups to environmental hazards, including extreme weather events. Advice on urban issues provided to many international agencies including UNICEF, UN Habitat, World Health Organization, OECD, the Swedish International Development Cooperation Agency (Sida), the Development Directorate of the European Commission, United Nations Population Division, DFID, UNRISD, DANIDA, ActionAid, WaterAid, CARE and the Brundtland Commission.