 His 2005 book "The Future of Large Dams" covers aspects of large dams and development including economics, politics, environmental risk, energy, agriculture, and human displacement and resettlement.He has undertaken studies on sustainable resource use in Africa, India, Nepal, Jordan, Indonesia, Malaysia, the Philippines, Sri Lanka, and the United States, and served on a number of independent review panels for dam projects in Africa and Asia.He is a former commissioner on the World Commission on Dams.