chang'an university

University of Oregon

Department of Paleobiology, National Museum of Natural History, Smithsonian Institution

Professor of Earth and Environmental Sciences, Wesleyan University

Curator of Paleobotany, Florida Museum of Natural History, University of Florida

Department of Paleobiology, National Museum of Natural History, Smithsonian Institution

Emeritus Professor of Earth Sciences, The Open University, UK

Professor, Pennsylvania State University, Department of Geosciences

Professor of Geology and Geophysics, Yale University

University of Adelaide