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.