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Raymond T. Pierrehumbert is Louis Block Professor in Geophysical Sciences at the University of Chicago. He was a lead author on the IPCC Third Assessment Report, and a co-author of the National Research Council report on abrupt climate change. He was awarded a John Simon Guggenheim Fellowship in 1996, which was used to launch collaborative work on the climate of Early Mars with collaborators in Paris. He is a Fellow of the American Geophysical Union, and has been named Chevalier de l'Ordre des Palmes Académiques by the Republic of France.
Pierrehumbert's central research interest is how climate works as a system and developing idealized mathematical models to be used to address questions of climate science such as how the earth kept from freezing over: the faint young sun paradox. Current interests include climate of extrasolar planets.
Pierrehumbert also contributes to RealClimate.
Selected papers 
- Pierrehumbert R.T. 2002: "The Hydrologic Cycle in Deep Time Climate Problems", Nature, 419, 191-198.
- Pierrehumbert R.T. 2003: "Counting the Cost", Nature, 422 (6929), 263.
- Goodman, J.C. and R.T. Pierrehumbert 2003: "Glacial flow of floating marine ice in Snowball Earth", J. Geophys. Res., 108 (C10), 3308, doi:10.1029/2002JC001471.
- Alley R.B., J. Marotzke, W.D. Nordhaus, J.T. Overpeck, D.M. Peteet, R.A. Pielke Jr., R.T. Pierrehumbert, P.B. Rhines, T.F. Stocker, L. Talley and J.M. Wallace, 2003: "Abrupt Climate Change", Science, 299, 2005-2010.
- Pierrehumbert, R.T. 2004: "High levels of atmospheric carbon dioxide necessary for the termination of global glaciation", Nature, 429, 646-649.
- Pierrehumbert, R.T. 2004: "Warming the world: Greenhouse effect: Fourier’s concept of planetary energy balance is still relevant today". Nature, 432, 677.
- Pierrehumbert, R.T. 2005: "Climate dynamics of a hard snowball Earth", J. Geophys. Res., 110 (D01111), doi:10.1029/2004JD005162.
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