Department of Earth Sciences, University of Toronto

University of Utah

University College London

Emeritus Davis Chair, Jackson School, UT Austin; Hon Professor

Professor of Geology, University of Alberta

Professor, Jackson School of Geosciences, University of Texas at Austin

Professor of Geology, Emeritus, UCLA

College of Science, University of Arizona

Professor, Department of Geoscience, University of Wisconsin-Madison

Professor, Jackson School of Geosciences, University of Texas at Austin