I have 25 years of experience, and specialize in the field of agricultural nutrient management with specific knowledge in the areas of soil phosphorus dynamics, soil nitrogen dynamics and nonpoint source nutrient pollution. I have published on such topics as phosphorus runoff from agricultural soils, agricultural nutrient management and water quality protection. I have testified on nonpoint source phosphorus loss assessment, agricultural nutrient management and agronomic fertilizer use efficiency. I launched a new academic department, environmental science and technology at a university of and served as the chair of this new department for five years.