Smithsonian National Museum of Natural History




1993 - 1996: Acting Associate Director for Science, National Museum of Natural History

1988 - Present: Administrative co-director of Evolution of Terrestrial Ecosystems Program (ETE), National Museum of Natural History, Smithsonian Institution

1987 - Present: Adjunct Professor, Geosciences Departments, University of Arizona, Tucson, AZ

1991 - Present: Adjunct Professor, Paleobiology Program, Department of Geology, University of Pennsylvania and Bryn Mawr College, Philadelphia, PA

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