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Schlumberger Professor of Geology, Massachusetts Institute of Technology. Investigated the processes of orogenesis and their relation to plate interactions and intraplate deformation. Major research efforts were in four areas: 1) the Cordilleran orogenic belt of western North America, 2) the Alpine belt of Eastern Europe, 3) the Caledonian belt of Scandinavia, and 4) north central China and Tibet. Research focused on processes of intracontinental deformation and is designed to examine orogenic belts and other regions of tectonic significance within the continents of different ages, tectonic settings and hence at different levels of exposure