Pierrehumbert’s research interests that include the physics of climate, especially regarding the long-term evolution of planetary climates. Pierrehumbert served the 2014-15 academic year as a King Carl XVI Gustaf Professor in Environmental Science at Stockholm University’s department of meteorology. He was a co-author of the Intergovernmental Panel on Climate Change’s Third Assessment (1997-2001). He has been recognized for his contributions to this work, for which the IPCC was awarded the 2007 Nobel Peace Prize, jointly with Al Gore, “for their efforts to build up and disseminate greater knowledge about man-made climate change, and to lay the foundations for the measures that are needed to counteract such change.” Pierrehumbert also is the author of Principles of Planetary Climate, and co-editor of The Warming Papers: The Scientific Foundation for the Climate Change Forecast. A former Guggenheim Fellow, he also is a fellow of the American Geophysical Union.