R. David Simpson has been Director for Ecosystem Economic Studies in the National Center for Environmental Economics at the United States Environmental Protection Agency, Senior Fellow at Resources for the Future, and has held academic appointments at Johns Hopkins University’s School of Advanced International Studies and University College London. Simpson’s research has focused on the valuation of biodiversity and ecosystem services, conservation policy, and innovation and industrial structure in environmental and resource policy. He was a coordinating lead author in the Millennium Ecosystem Assessment and is the author of numerous journal articles, book chapters, and policy papers, and is the coeditor of three books. Simpson earned a BA in economics from Whitman College and a Ph. D. in economics from MIT.