My research is focused on the subsurface part of the hydrologic cycle. Groundwater globally contributes to 2/3 of all streamflow and is essential component of any hydrologic budget. My work is focused on how water becomes groundwater and the sub-surface processes that impact it along its journey. This includes understanding how groundwater contributes to streamflow generation and springs. I also do a lot of work to understanding how much water is available for a region at a given time in geologic history and what the source of this water is. My research has taken me all over the globe from Japan to the Island of Tobago. Some of my current work is focused on lithium brines in the Great Basin of the western United States and the wild of the Atacama desert in northern Chile.