Barry S. Levy, M.D., M.P.H., is an environmental and occupational health specialist with more than forty years of experience in this field. He has edited and written twenty-one previous books. He is an Adjunct Professor at Tufts University School of Medicine and a past president of the American Public Health Association. Jonathan A. Patz, M.D., M.P.H., has taught and conducted research on the health effects of climate change for thirty years and has authored major national and international reports on this subject. He is a Distinguished Professor and Endowed Chair of Health and the Environment at the University of Wisconsin - Madison.