Assistant Professor, University of Washington, 1988
Affiliate Staff Scientist at Pacific Northwest Natl. Labs. Richland, 1994
Adjunct Prof., Physics Department, University of Washington, 1994
Adjunct Prof., Materials Sci. and Eng. Department, University of Washington, 1994
Associate Professor, University of Washington, 1995
Visiting Professor, Technical Univ. of Denmark, Physics Dept., 1995
Professor, University of Washington, 1999
Professor, University of Iceland, 2000
Director of Chemistry Division, Science Institute, University of Iceland, 2003
Visiting Professor, Technical University of Denmark, Physics Department, 2004
Adjunct Professor of Chemistry (Research) Brown University, 2006