Dr. Chad Penn is a Research Soil Chemist at the USDA-ARS National Soil Erosion Laboratory located on campus at Purdue, and Adjunct Professor of Soil Chemistry in the Department of Agronomy at Purdue. He received an M.S. degree in Environmental Soil Science from the University of Delaware and a Ph.D. degree in Soil Chemistry from Virginia Tech. He studies soil chemical processes in the context of solving agronomic and environmental problems and increasing agricultural production and efficiency while minimizing environmental impact. His current research is focused on nutrient solubility and kinetics, especially phosphorus, as it pertains to both fertility and losses in drainage water