Chair Professor of Earth Sciences, The University of Hong Kong

Institute of Geology and Geophysics, Chinese Academy of Sciences

Emeritus Professor of Geology, Harvard University

Associate Professor, University of California, Riverside

Professor of Geology, Department of Geology, APK Campus, University of Johannesburg

Senior Research fellow, Curtin University

University of Florida

Professor of Earth & Space Sciences and Astrobiology Program, University of Washington

Professor of Geology and Geophysics, China University of Geosciences, Beijing

Research Scientist, NASA Ames Research Center