| 2006-present. | Rachel Hertog, M.S., Biology, San Francisco State University. |
| 2005-present. | Martin Olson, M.S., Biology, San Francisco State University. |
| 2004. | Zita Maliga, M.S., Geosciences, San Francisco State University. |
| 1998. | Angie Charles, Army Corps Engineers. M.S., Biology, Southeast Missouri State University. |
| 1997. | Brent Hopkins. M.S., Biology, Southeast Missouri State University. |
| 1997. | Richard Pelikan, Computer Services, Southeast Missouri State University. M.S., Biology, Southeast Missouri State University. |