| APPOINTMENTS
The Pennsylvania State University, University Park, Pennsylvania
- Director, Astrobiology Research Center, 7/98 - 10/08.
- Director, Ore Deposit Research Section, 12/96 - 10/08.
- Professor of Geochemistry, 7/78 - present.
- Associate Professor of Geochemistry, 7/74 - 6/78.
- Assistant Professor of Geochemistry, 11/70 - 6/74.
Tohoku University, Sendai, Japan
- Professor of Geochemistry and Director of Research Center for
Natural Resources and Environmental Geochemistry, 6/87 - 3/98.
University of Tokyo, Tokyo, Japan
- Professor of Geochemistry, 10/93 - 3/95.
The University of Alberta, Edmonton, Alberta, Canada
- Lecturer of Geochemistry, 9/69 - 10/70.
- Killam Research Fellow, 11/68 - 8/70.
Princeton University, Princeton, New Jersey
- Research Associate, 9/68 - 10/68.
- Research Assistant, 9/64 - 8/68.
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