| 2006 - present |
Associate Professor, Department of Biological Sciences, Wichita State University |
| 2000 - 2006 |
Assistant Professor, Department of Biological Sciences, Wichita State University |
| 1998 - 2000 |
Assistant Professor, Department of Biology, Grinnell College |
| 1993 - 2000 |
Assistant Professor, Adjunct, Department of Biological Sciences, The University of Iowa |
| 1993 - 1999 |
Visiting Assistant Professor, Kellogg Biological Station |
| 1992 |
Postdoctoral Ecologist, Unisted States Forest Service, Pacific Northwest Research Station, Forestry Sciences Laboratory, Juneau, Alaska |
| 1988 - 1990 |
Postdoctoral Fellow, The Ecology Group and Department of Zoology, University of British Columbia, Vancouver, British Columbia |