Assistant Professor of Geology, Department of Geological Sciences and Lamont-Doherty Geological Observatory of Columbia University, Palisades, New York; 1989-1993
Research Assistant and Teaching Assistant, Department of Geology and Geophysics, University of California at Berkeley; 1983-1989
Research Geologist, U.S. Bureau of Reclamation, Engineering and Research Center; Denver, Colorado; Seismotectonics Section, 1981-1983, GS 11
Research Geologist, U.S. Bureau of Mines, Research Center; Denver, Colorado; Rock Mechanics Branch, 1979-1981, GS 9
Undergraduate Teaching Assistant: Introductory Earth Sciences, 1975
Field Assistant, Peter Birkeland, neoglacial stratigraphy of the Wind River Mountains, Wyoming, summers: 1972, 1973