Raymond S. Bradley is climatologist. Bradley is a University Distinguished Professor in the Department of Geosciences at the University of Massachusetts Amherst. He is also the research director of the Climate System Research Center. Bradley's work indicates that the warming of Earth's climate system in the twentieth century is inexplicable via natural mechanisms.

My interests are in climate variability across a wide range of time scales. I’m particularly interested in how present day climate differs from climates in the past, and what may have caused climates to change.

I have written or edited ten books on climatic change and paleoclimatology, including Paleoclimatology: Reconstructing Climates of the Quaternary , and I‘ve authored over 100 articles on these topics.