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Smithsonian National Museum of Natural History
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Adjunct faculty member, University of Maryland, Department of Entomology (from 1996) and BEES Program (from 2009)

Research Associate, Denver Museum of Nature and Science (from 2005)

Member, USNM Personnel Accomplishments and Evaluation Committee (2003)

Paleontological Society Lecturer (1993-1994)


Editorial Service

Board of Editors and Subject Editor, Ecology and Ecological Monographs (from 2002)

Member, Managing Editorial Committee, Acta Geologica (Barcelona) (from 2002)



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