Don Rosenberry is a research hydrologist with the U.S. Geological Survey in Lakewood, Colorado, specializing in hydrogeology and geomorphology. Don studies the hydrology and hydrogeology of lakes, wetlands and streams, with a primary interest in improving our understanding of flow between groundwater and surface water and the processes that affect and control that exchange. Development of new tools and methods for quantifying groundwater-surface-water exchange has been a particular emphasis during the past decade. Although Don is based in Colorado, he has benefitted greatly through working at long-term research and monitoring sites in Nebraska, North Dakota, Minnesota, and New Hampshire.