I conduct interdisciplinary long-term research on the fate and geochemical effect of organic contaminants in subsurface environments in order to understand the impacts of man’s activities on the quality of the Nation’s water resources. I have published on the natural attenuation of crude oil, gasoline, and landfill leachate and am investigating the secondary effects of natural attenuation, including mobilization of arsenic. http://profile.usgs.gov/icozzare