Dale Robertson is a Research hydrologist with the U.S. Geological Survey at the Upper Midwest Water Science Center in Madison, Wisconsin, USA. His current research deals with modeling eutrophication and mixing in lakes, estimating loads and concentrations of nutrients and sediment in streams over large geographic areas, such as the Great Lakes and Mississippi River Basins, developing nutrient criteria for streams and rivers, and examining the effects of various environmental factors on the physical dynamics, ice cover, and productivity of lakes.