Marc Levy is deputy director of the Center for International Earth Science Information Network (CIESIN), a research and data center of the Earth Institute of Columbia University that utilizes scientific data and advanced information technology to advance understanding of how humans affect and manage the environment, and in turn, how environmental variability and change affect society. He also serves as an adjunct professor in Columbia’s School of International and Public Affairs. He is a political scientist specializing in the human dimensions of global change. He is an expert on environment-security connections, environmental sustainability, emerging infectious diseases, the geography of poverty, and the effectiveness of international environmental institutions. His work has been supported by a large number of national and international agencies. He serves as lead project scientist of the NASA Socioeconomic Data and Applications Center operated by CIESIN, and he directs the Earth Institute’s Cross-Cutting Initiative on Environment-Security Linkages. He has served on a number of global environmental assessments and frequently advises national governments and international organizations on global change issues. Before coming to CIESIN in 1998 Mr. Levy had teaching appointments at Princeton University and Williams College.