Principal Scientist
Southwest Research Institute
San Antonio, TX U.S.A.
1993 - present
Senior Physicist
Computational Physics, Inc.
Fairfax, VA U.S.A.
1990 - 1993
Assistant Research Physicist
Space Sciences Laboratory
University of California
Berkeley, CA U.S.A.
1986 - 1990
Assistant Professor
Department of Physics, &
Graduate Programme in Experimental Space Science
York University
Toronto, Canada
1984 - 1986
Project Scientist
Centre for Research in Experimental Space Science
York University
Toronto, Canada
1981 - 1984
Staff Scientist
Max-Planck-Institut für Aeronomie
Katlenburg-Lindau, Germany
1980 - 1981
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