I am a professor in Environmental Engineering at Penn State University. My training is in environmental engineering and water resources. My work asks questions on how external drivers and internal structure regulate water flow paths and biogeochemical processes in the Critical Zone under diverse climate, geology, and land use conditions. My group (@LiReactiveWater) uses data analysis and reactive transport modelling tools. We collaborate broadly with scientists from different backgrounds including hydrology, biogeochemistry, ecology, and geology.