Dr. Christopher J. Portier is a semi-retired expert in the design, analysis, and interpretation of environmental health data with a focus on carcinogenicity. Dr. Portier is currently a Senior  Collaborating Scientist (part-time) with the Environmental Defense Fund (EDF), and an Adjunct Professor at Emory University. He has authored more than 200 peer-reviewed publications and book chapters. During his 40+ years of research, Dr. Portier has focused on using systems-based approaches to understand the impact of the environment on human health. He has received numerous awards including the President’s Dream Green Team Award (2010), the Spiegelman Award from the American Public Health Association, and the Outstanding Practitioner of the  Year Award from the International Society for Risk Analysis. He is an elected Fellow of the  International Statistics Institute, the World Innovation Foundation, the American Statistical  Association, and the Collegium Ramazzini. He has served on numerous advisory committees at  U.S. EPA, National Council on Science and Technology, World Health Organization, European Commission, and others. Prior to his retirement, Dr. Portier served as the Director of the US  National Center for Environmental Health at the Centers for Disease Control and Prevention and Director of the Agency for Toxic Substances and Disease Registry. Prior to this, Dr. Portier was at the U.S. National Institute of Environmental Health Sciences (NIEHS) where he conducted research on environmental health and served as the Director of the Environmental Toxicology  Program, the Associate Director of the National Toxicology Program, and the Senior Scientific  Advisor to the Director of NIEHS. His current research is focused on air pollution, climate change, and risks from chemical exposures. He is also consulting on risks from several environmental exposures with law firms globally.