Using microbiology as a central tool, I have been specializing in nutrient cycling and soil quality in wetland and upland systems, microbial diversity and activity in soils, pesticide degradation, transport, and potential groundwater contamination, isolation and characterization of pesticide degrading microorganisms, biocontrol of invasive plant species, bioenergy and microbial hydrogen production, marine and freshwater toxins and microbial degradation, and soil-plant-microbial interactions.