conducts research on the regulation of nutrient cycling in terrestrial ecosystems and land-water interactions. He has carried out extensive experimental and comparative studies of nutrient cycling in tropical and temperate forests and has demonstrated that biological invasions by exotic species can alter ecosystem-level properties in the areas they invade. His laboratory is at the forefront of efforts to understand nutrient cycling in forest ecosystems and is now working toward understanding interactions between components of global change and terrestrial ecosystems. Dr. Vitousek holds a Ph.D. in biological sciences from Dartmouth College.

Staff Member Information

Sherburne B. Abbott joined the Policy Division of the National Research Council (NRC) in January 1997 as the executive director of the Board on Sustainable Development. She has worked with the NRC for 12 years, serving previously as the director of the Committee on International Organizations and Programs of the Office of International Affairs, and the Polar Research Board of the Commission on Geosciences, Environment, and Resources. Prior to her work with the NRC, she was assistant scientific program director for the U.S. Marine Mammal Commission, a science teacher in a private high school, and a research assistant at the Tufts University Cancer Research Center. She has published papers on environmental monitoring in Antarctica, salmonid biology, and polar research. She holds an A.B. in biology from Goucher College and an M.F.S. in ecology and natural resource policy from Yale University.

Sylvia A. Edgerton joined the Policy Division as a senior research fellow from April 1998 to April 1999 on loan from the U.S. Department of Energy through the Pacific Northwest National Laboratory. She previously served as deputy director of the coordinating Office of the U.S. Global Change Research Program and as a senior research associate for the Committee on Earth and Environmental Sciences under the Federal Coordinating Council for Science, Engineering, and Technology. She has also worked both nationally and internationally in air quality research and environmental risk assessment. Dr. Edgerton received her B.S. in physics from the University of Arizona and her M.S. and Ph.D. in environmental science from the Oregon Graduate Institute of Science and Technology.

Laura J. Sigman joined the National Research Council as a research associate with the Board on Sustainable Development and the Committee on Global Change Research in February 1997. She holds an A.B. in environmental studies from Dartmouth College.

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