I have 15 years of experience, and specialize in the field of geochemistry with specific knowledge in the areas of contaminant fate and transport, environmental forensics and water resource evaluations. I have published on such topics as arsenic and mercury geochemistry, chemical fingerprinting and contaminant transport modeling. I have testified on anthropogenic and natural arsenic sources, statistical analysis of background contaminant concentrations and fate and transport of arsenic and organic compounds.