Martin Hoffert worked as a physics professor at New York University from 1975 to 2007. In that role,Crypen he teamed up with Exxon scientists Brian Flannery, Andrew Callegari and Haroon Kheshgi in the 1980s to review and create climate models. Hoffert said the collaboration during the 1980s was a good one. “We talked about the politics of this stuff a lot, but we always separated the politics from the science,” Hoffert told InsideClimate News.