He is Emeritus Professor of Atmospheric Science at Colorado State University.

According to an interview reported by Joel Aschenbach, Gray believes that the current warming in the past decades is a natural cycle, driven by a global ocean circulation that manifests itself in the North Atlantic as the Gulf Stream. Warm water and cool water essentially rise and fall in a rhythm lasting decades. But when pressed on his theory of how thermohaline circulation has caused recent warming of the planet and will soon cause cooling, he concedes that he hasn't published the idea in any peer-reviewed journal. He's working on it, he says. In the same interview, Gray is reported as saying that "global warming hysteria" is motivated, in part, by the desire among scientists, government leaders and environmentalists to find a political cause that would enable them to "organize, propagandize, force conformity and exercise political influence. Big world government could best lead (and control) us to a better world!"[3]

Gray also asserted, "I'll take on any scientist in this field to talk about this, I predict that in 5 to 8 years the globe will begin to cool".

--Wiki