| Date | Title | Deparment and Institution |
| 1993 to present | Professor |
Department of Statistics
University of California, Davis
|
| 1996-1998 | Associate Vice Provost, University Outreach |
University of California, Davis
|
| Winter 1994 |
Visiting Senior Research Fellow
|
Dept. of Psychology
University of Edinburgh (Scotland)
|
| 1988-1993 | Director |
Statistical Laboratory
University of California, Davis
|
| 1987-1989 | Visiting Scientist |
Cognitive
Sciences Program
SRI International, Menlo Park,CA |
| Summer 1983, 1984-1985 | Visiting Professor | Department of Statistics
Stanford University |
| 1979-1993 | Assistant and Associate Professor | Division of Statistics
University of California, Davis |
| 1978-1979 | Assistant Professor | Department of Mathematics
University of California, Davis |
| 1978 | Instructor | Department of Statistics
Penn State University |