Noah S. Diffenbaugh (born July 23, 1974) is an American climate scientist at Stanford University, where he is the Kara J Foundation Professor of Earth System Science and Kimmelman Family Senior Fellow at the Stanford Woods Institute for the Environment, and an affiliate at the Precourt Institute for Energy. From 2015-2018, he served as editor-in-chief of the peer-review journal Geophysical Research Letters (published by American Geophysical Union). He is known for his research on the climate system, including the effects of global warming on extreme weather and climate events such as the 2011-2017 California drought.