Michael E. Mann is Distinguished Professor of Atmospheric Science and director of the Earth Systems Science Center at Penn State University. He is the author of The Hockey Stick and the Climate Wars: Dispatches from the Front Lines (Columbia, 2012) and a fellow of the American Meteorological Society, the American Geophysical Union, and the American Association for the Advancement of Science. Tom Toles is the Pulitzer Prize-winning cartoonist of the Washington Post . He has a particular interest in climate change science and has worked consistently to advance understanding of this subject, including its political context, since the 1980s.