My research program asks and answers fundamental and timely questions centered on understanding how human activities influence streams, rivers, lakes, and wetlands. My approach to research integrates across the fields of limnology, biogeochemistry, and microbial ecology. Humans are increasingly modifying multiple elemental cycles, through farming and fertilizer application, burning fossil fuels, and land use change altering rates of sediment and nutrients delivered to aquatic ecosystems. Thus, questions asked in the research program have valuable connections valuable connections to environmental concerns including global change, land use change with an emphasis on agricultural landscapes, and the impacts of excess nutrients on lakes and rivers.