At Stone, Les integrates field and scientific knowledge to develop solutions to assess environmental exposure from crop protection chemicals. He has over 25 years of experience conducting water-quality investigations and environmental fate studies ranging from field plot scale to national scale monitoring. Les’ expertise includes programs to develop data from surface water, groundwater, soil, air, and biological matrices. He has served as Principal Investigator and/or Study Director for numerous field programs under the USEPA Federal Insecticide, Fungicide, and Rodenticide Act (FIFRA) and Good Laboratory Practice (GLP) Standards.