Regents Professor, Earth & Environmental Sciences, U. Minnesota

Professor Emeritus, Australian National University

Woodwardian Professor of Geology, University of Cambridge

Goethe Universität Frankfurt

Bristol, Exeter, Newcastle, Birmingham, UNSW

Professor of Geology, University of Johannesburg

Professor emeritus, The University of Melbourne

Professor of Geochemistry, University of Maryland

Professor of Earth and Space Sciences, University of Washington

Department of Geology, University of Maryland