| Employer | Title or Rank | Period |
|---|---|---|
| Northern Arizona University Dept. of Biological Sciences | Professor | 2015-present |
| University of Sao Paulo Grad. Prog. in Ecology | Professor | 2019-present |
| Northern Arizona University Center for Bioengineering Innovation | Associate Director | 2015-2019 |
| University of Alaska Anchorage Department of Biological Sciences | Professor | 2010-2015 |
| University of Alaska Fairbanks Department of Chemistry & Biochemistry | Affiliate Professor | 2018-present |
| University of Alaska Anchorage Department of Biological Sciences | Associate Professor | 2007-2010 |
| University of Alaska Anchorage Department of Biological Sciences | Assistant Professor | 2006-2007 |
| University of Alaska Fairbanks School of Fisheries & Ocean Sciences | Assistant Professor | 2001-2006 |
| University of South Dakota Department of Biology | Assistant Professor | 1999-2001 |
| University of Alaska Fairbanks School of Fisheries & Ocean Sciences | Research Assistant Professor | 1998-1999 |