I have 28 years of experience, and specialize in the field of environmental toxicology with specific knowledge in the areas of toxicity of metals to aquatic ecosystems and human health, toxicity of persistent organic pollutants to aquatic ecosystems and human health and water quality and water pollution impacts. I have published on such topics as impacts of metals on aquatic ecosystems and human health, principles of limnology and impacts of oil spills on fish. I have testified on lake water quality, impacts of development on beneficial uses of lakes and impacts of oil spills on fish.