Scott Barrett, one of the world’s leading environmental policy economists, will join the SIPA faculty with a joint appointment in the Earth Institute in the fall of 2009 as the first Lenfest Professor of Natural Resource Economics. Since 1999, Professor Barrett has served on the faculty of Johns Hopkins University’s Paul H. Nitze School of Advanced International Studies. Professor Barrett’s research focuses on interactions between changes in the environment (such as the climate or the ecology of a pathogen) and international institutions and regulatory regimes such as the Kyoto Protocol and the World Health Assembly’s efforts to eradicate polio.