smoothly working procedures in the positions he held and partially created, he set the accelerator governance form at the laboratory that was used with little change in the more than two decades after he left Brookhaven in 1970. At that time he accepted the newly established position of professor of high-energy physics at Rockefeller University.

Cool took a year's sabbatical leave to CERN in the summer of 1962, living in Geneva with Margaret and the children—and new baby Adrienne (who later followed her father in science and is in 1977 an assistant professor of astronomy in the physics and astronomy department at San Francisco State University.) At CERN he worked on the experimental program at the PS accelerator, nearly a twin of the 30-GeV AGS accelerator at Brookhaven, and renewed old friendships with the French physicists from the Ecole Polytechnic, who had worked as students in Colorado on cosmic ray experiments at the same time as Rod in the late 1940s. Rod, Margaret, and the family were to return to Geneva again for a year in 1968–69 and after Cool left Brookhaven for Rockefeller University in the fall of 1970 he worked primarily at CERN, where he and Margaret kept an apartment in Ferney-Voltaire, France, five minutes from CERN. Over the next two decades Rod and Margaret spent about half of their time in their French apartment and about half in their apartment near Rockefeller University in New York.

When Cool joined Rockefeller, his old antipathy to the classroom teaching of elementary physics to undergraduates was not tested, as Rockefeller admitted only graduate students. And after twenty years of increasingly high-level administration at Brookhaven, where he had helped mold the laboratory and set a pattern for high-energy physics administration everywhere, Rod, now fifty years old, never again held an onerous administrative position; he had paid