I have 20 years of experience, and specialize in the field of human health effects of environmental exposures with specific knowledge in the areas of human health effects of PCBs, dioxins, metals, electromagnetic fields. I have published on such topics as human health effects of PCBs, dioxins, chlorinated pestidies, metals like lead and methyl mercury, powerline and radiofrequency electromagnetic fields, effects of various contaminants on nervous system function. I have testified 15 times on topics such as human health effects of PCBs or dioxins, powerline electromagnetic fields and health effects of living near landfills and hazardous waste sites.