| 2013-Present | Presidential Chair in Science, University of Oregon |
| 2001-13 | Richard M. and Patricia H. Noyes Professor of Chemistry, University of Oregon |
| 1998-01 | Knight Professor of Liberal Arts and Sciences, University of Oregon |
| 1991-Present | Professor of Chemistry, University of Oregon |
| 1991-1995 | Director, Chemical Physics Institute, University of Oregon |
| 1985-91 | Associate Professor of Chemistry, University of Oregon |
| 1980-85 | Assistant Professor of Chemistry, Bryn Mawr College |