Dr. Charles A. Menzie is a Principal Scientist in Exponent’s Ecological and Biological Sciences practice. He specializes in the application of risk assessment and causal analysis methods for evaluating the potential for effects and for diagnosing the causes of environmental harms and damages. His technical expertise includes the evaluation of the environmental fate and effects of physical, biological, and chemical stressors on terrestrial and aquatic systems. He has applied his expertise to situations involving nutrient enrichment, chemical contamination, use of pesticides and other chemical products, oil and gas operations, fossil fuel and nuclear power plants, alternative energy projects, mining, invasive species, water management, and vulnerability assessments for climate change. He has a working knowledge on how to approach these issues within the appropriate national and international policy and regulatory frameworks.
Having worked in the environmental field for close to 40 years, Dr. Menzie has had wide geographic experience. This includes all geographic regulatory jurisdictions in the United States (e.g., U.S. EPA Regions) and Canada (provinces). He has also worked in South America (Ecuador, Colombia, Argentina and Uruguay), the middle east (Yemen), the South China Sea, the Indian Ocean (Diego Garcia), and Australia.
Dr. Menzie has provided his ecological and environmental expertise on issues in a diversity of environments. These include most coastal areas of the United States, major river systems of North and South America, freshwater lakes, forest ecosystems of California, rainforests of Ecuador, salt and other marshes of the east and Gulf coasts, the Atlantic outer continental shelf and slope off North America, deep water environs off Hawaii and Puerto Rico, the desert island atoll of Diego Garcia, and the Yemen desert.
With regard to particular groups of compounds, Dr. Menzie has extensive experience with polychlorinated biphenyls (PCBs), polycyclic aromatic hydrocarbons (PAHs), chlorinated pesticides, commercial biocides, and metals with an emphasis on lead, chromium, arsenic, cadmium, and nickel. As part of his risk assessment practice, he has developed exposure and food web models to evaluate how people and ecological receptors may be exposed to these chemicals. These include several spatially-explicit models used to refine exposure estimates. Dr. Menzie has also worked on nutrient enrichment issues related to nitrogen and phosphorus.