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| Ph.D. 1988 | Geochemistry, Research School of Earth Science, Australian National University |
| M.S. 1983 | Geochemistry, Sul Ross State University, Alpine, TX, USA |
| B.A. 1979 | Anthropology, University of Massachusetts, Boston, MA, USA |
| 1978-80 | Consultant Geologist, Private practice, Oregon, USA |
| 1987-89 | Von Humboldt Fellow, Max-Planck Institute fur Chemie, Mainz, Germany |
| 1989-94 | Research Fellow, Research School of Earth Science, Australian National Univ. |
| 1995 | Lecturer, Boston University, Dept. of Earth Sciences |
| 1994-2000 | Research Associate, Dept. of Earth & Planetary Sciences, Harvard University |
| 2000-05 | Associate Professor, University of Maryland, Department of Geology |
| 2005-present | Professor, University of Maryland, Department of Geology |
| 2010-present | Affiliate Professor, University of Maryland, Department of Chemistry |
| 2011 | Guest Professor, China University of Geosciences (Wuhan), China |