Dr. Williams is a staff geological scientist in the Energy Geosciences Division of the Lawrence Berkeley National Laboratory in Berkeley, California and the author or co-author of over 70 peer-reviewed publications. He received a B.S. in Geology, an M.S. in Geophysics, and a Ph.D. in Environmental Science, Policy & Management from the University of California, Berkeley. He has been a pioneer in the field of biogeophysics, with a particular emphasis on the development of electrochemically-based techniques for characterizing subsurface microbial activity. His current research interests include seasonal variations in redox-sensitive metals and radionuclides and the role of floodplains as repositories for critical elements, such as carbon, nitrogen, sulfur, iron and manganese. He currently serves as a Lead for the Earth Sciences Division’s Environmental Remediation and Water Resources Program and serves as the chief scientist and field site manager for the U.S. Department of Energy’s Rifle, Colorado (USA) field station, which seeks to quantify coupled microbiological, geochemical, and hydrological processes that control elemental cycling within floodplain deposits along the Colorado River corridor.