I have conducted scientific research mostly focused on aquatic or underground environments on the U.S. Great Lakes and inland waters in Wisconsin and Washington State, North Atlantic, Southern Ocean, the Antarctic Dry Valleys and the deep subsurface in South Africa, Canada, and the United States. The underground work employs mines, natural caves, and boreholes from surface. I have published over 90 peer-reviewed papers, have appeared in the scientific and popular press many times and have numerous technical reports, white papers, and other works. My work has been cited over 7,700 times, with an h-index of 39 and i10-index of 63 (02/26/2026). Currently, my work focuses on life in extreme environments, astrobiology, emerging contaminants, using environmental DNA as a conservation tool, and molecular archaeology.
I have been an associate professor in the Division of Hydrologic Sciences at Desert Research Institute since 2017. Prior to that I was an associate or assistant professor in the Division of Earth and Ecosystems Sciences at DRI (appointed in 2005). I am adjunct professor in the UNLV School of Life Sciences, Department of Geosciences, and Water Resources Management. I did postdoctoral fellowships at Princeton University in Geosciences and the Pacific Northwest National Laboratory. I obtained a Ph.D. (With Distinction) in Limnology and Oceanography from the University of Wisconsin Milwaukee and the Center for Great Lakes Studies and M.S. and B.S. degrees in Microbiology from the University of Wisconsin, Oshkosh and an associates degree in Reclamation/Geology from the University of Wisconsin, Platteville.
