Susan Kieffer is Walgreen Chair and Center for Advanced Study Professor of Geology and Physics. She received her B.S. from Allegheny College and her M.S. and Ph.D. from the California Institute of Technology. Professor Kieffer is known for her work in geological fluid dynamics and for the Kieffer Model of heat capacities and thermodynamic properties of complex materials. She was the second American and first (and only) woman to be awarded the Spendiarov Prize of the U.S.S.R. Academy of Sciences. Professor Kieffer has received an Alfred P. Sloan Foundation Fellowship, the Department of Interior Meritorious Service Award, The Mineralogical Society of America Award, and the Day Medal of the Geological Society of America. She is a member of the National Academy of Sciences, MacArthur Fellow and a Fellow of the American Academy of Arts and Sciences.