Roger Brewer is senior scientist and environmental hazard assessment specialist with the Hawai'i Department of Health. His environmental experience includes regulatory compliance audits, field investigations, contaminant fate and transport modeling and human health and ecological risk assessments. He has been instrumental in the development and field implementation of the state's Decision Unit and Incremental Sampling Methodology guidance, initiated in 2004. Roger has also worked as an environmental consultant in the US, Asia and South America and as a senior geologist and environmental risk assessment specialist for the California Environmental Protection Agency. His academic background includes a PhD in geology.