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Daniel Sigman is the Dusenbury Professor of Geological and Geophysical Sciences and a professor in the Department of Geosciences at Princeton University. His research focuses on the global cycles of biologically active elements, particularly nitrogen and carbon. He is actively developing analytical techniques to study the nitrogen cycle in the environment. Sigman investigates the historical cycles to understand the causes of past changes in atmospheric concentrations of carbon dioxide and the role of this greenhouse gas during the waxing and waning of ice ages, as well as the ocean's response to climate change.
GRE scores are not accepted. Ph.D. is the primary degree; students are not required to hold an M.S.E. prior to admission.