- Instructor, University
of Utah, 1976-79
- Assistant Professor, Arizona
State University, 1979
- Associate Professor, Arizona State University,1982
- Visiting Associate Professor, Brown
University, 1985-86
- Professor, Arizona State University,1987
- Interim chair, Arizona State University,1991-92
- Visiting Research Scientist, Georgia
Institute of Technology, 1992-93.
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