Charles Perrings is professor of environmental economics at Arizona State University (ASU). At ASU he directs (with Ann Kinzig) the ecoSERVICES Group of the College of Liberal Arts and Sciences. The group studies the causes and consequences of change in ecosystem services—the benefits that people derive from the biophysical environment. Dr. Perrings cochairs (with Shahid Naeem) the ecoSERVICES core project of DIVERSITAS, the international program of biodiversity science. The group contributes to international research projects on issues relating to biodiversity change, conservation, and development, and it supports training in biodiversity and ecosystem services both within ASU and internationally. It runs the Biodiversity and Ecosystem Services Training Network, a research coordination network funded by the National Science Foundation. Dr. Perrings was an editor of the Cambridge University Press journal Environment and Development Economics, and he remains on its editorial board and those of several other journals in environmental, resource, and ecological economics, and in conservation ecology. He is past president of the International Society for Ecological Economics, a society formed to bring together the insights of the ecological and economic sciences to aid understanding and management of environmental problems. He has advised various governmental, intergovernmental, and international nongovernmental organizations, as well as research-funding agencies. In Britain he served on the Royal Society’s Environment Committee, the WHAT Commission on Genetic Diversity in Food Crops and the Center for Ecology and Hydrology (Natural Environment Research Council) Program Review Board. Dr. Perrings has published extensively in leading journals, including the Journal of Marine Science, Ecological Modelling, Trends in Ecology and Evolution, and Ecological Economics. Dr. Perrings received his Ph.D. from the University of London.