1986: Professor of Geological Sciences, Cornell University, Ithaca, NY
1989: Adjunct Professor, Lamont-Doherty Geological Observatory of Columbia University
1989-2005: Co-Director Global Basins Research Network
1998-2006: Chief Scientist and Chairman of the Board of Geogroup Inc.
1982-1986: Senior Research Geophysicist, Chevron Oil Field Research Co., La Habra, CA
1978-1982: Associate Professor of Geosciences, The Pennsylvania State University, University Park, PA
1971-1978 : Director, Mineral Technology (Section Head 1977-1978, Project Leader 1 ...