Development planner specialising in integrating environmental health and resource management into urban plans and policies. Works with the Human Settlements Programme at the International Institute for Environment and Development (IIED). Advises many international agencies on urban policy; Editor of the international journal Environment and Urbanization and co-author of several Earthscan books including Environmental Problems in an Urbanizing World: Local Solutions for Cities in Africa, Asia and Latin America (with Jorge E. Hardoy & Diana Mitlin), Earthscan, 2000.