Helen E. Dahlke, Ph.D., is an associate professor in Integrated Hydrologic Sciences at the Department of Land, Air and Water Resources at the University of California, Davis. Her research focuses on contributing to a better mechanistic understanding of hydrological processes and their links to climate and biogeochemical cycling. She holds a master’s degree in Geography, Geohydrology, and Geoinformatics and a Ph.D. in Environmental Engineering from Cornell University. Helen’s current research interests include surface water–groundwater interaction, water resources management, vadose zone transport processes, hydrologic response functions, and applications of DNA nanotechnology in hydrology.