Barry S. Levy, M.D., M.P.H. is an Adjunct Professor of Public Health at Tufts University School of Medicine and a consultant in environmental and occupational health. He has had a wide range of experiences in public health practice, education, research, policy development, and consultation. He has served as a medical epidemiologist with the Centers for Disease Control, a Professor at the University of Massachusetts Medical School, a leader of several international health programs and projects, and president of the American Public Health Association. He has co-edited 17 multi-contributor books, nine of which have focused on environmental and occupational health. Jonathan A. Patz, M.D., M.P.H., is Director of the Global Health Institute and Professor of Environmental Sciences and Population Health Sciences at the University of Wisconsin-Madison. He is one of the most recognized, long-standing experts on the health implications of global climate change. He has authored over 80 scientifically peer-reviewed papers on the subject. Dr. Patz served as a lead author on the Intergovernmental Panel on Climate Change (IPCC) for 14 years, and co-chaired the Health Expert Panel of the first U.S. National Assessment on Climate Change. He has taught and conducted research on climate change and its relationship to health for nearly two decades.