Dr. Mark Stelljes is an environmental consultant and the director of risk assessment and toxicology services for SLR International Corp, in Martinez, California. Recently, he has also been globally involved in product stewardship, focusing on review and interpretation of toxicology studies in the registration of new chemicals and setting safe occupational exposure limits for these chemicals. Dr. Stelljes is actively involved in the Society for Risk Analysis, Society of Environmental Toxicology and Chemistry, and the Society of Toxicology.