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The Center for Isotope Geochemistry (CIG) is a joint-institution research center, with labs both at LBNL and UC Berkeley. This state-of-the-art analytical facility was established in 1988 to measure the concentrations and isotopic compositions of elements in rocks, minerals, and fluids in the earth’s crust, atmosphere, and oceans. CIG has a community of roughly 25 people—scientists, research lab staff, postdoctoral researchers, graduate students, and administrative/computer support staff. It is directed by Donald J. DePaolo, (Associate Lab Director of Energy & Environmental Sciences) at Lawrence Berkeley National Lab, and Class of 1951 Professor of Geochemistry, Department of Earth and Planetary Science, UC Berkeley.