Melanie Gross, PhD is an environmental toxicologist with over 19 years of experience in environmental research, consultancy and regulation. She is a member of the Society of Toxicology and the Society of Environmental Toxicology and Chemistry. Melanie’s main areas of expertise are endocrine disruption, risk assessment of biologically active substances, and weight of evidence evaluations. After completing her PhD at the University of London in 2001, Melanie joined the Environment Agency of England and Wales‘ Science Group, where her main responsibilities were conducting and managing R&D projects on endocrine disruption. Other responsibilities encompassed the management and day to day operation of the Environment Agency’s Environmental Toxicology Advisory Service and technical secretariat for the Joint Agency Groundwater Directive Advisory Group. In 2007 Melanie joined wca, where she was project executive for the area of biologically active chemicals, responsible for environmental risk assessment of pharmaceuticals, veterinary medicines, and biocides, as well as weight of evidence reviews to determine endocrine disrupting chemicals under various pieces of legislation. Melanie now works as an independent consultant, continuing to focus on the assessment of endocrine disrupting properties, and environmental and human health risk assessment.