In 1950 James Tobin moved to Yale University, where he remained for the rest of his career. He joined the Cowles Foundation, which moved to Yale in 1955, also serving as its president between 1955–1961 and 1964–1965. His main research interest was to provide microfoundations to Keynesian economics, with a special focus on monetary economics. One of his frequent collaborators was his Yale colleague William Brainard. In 1957 Tobin was appointed Sterling Professor of Economics at Yale. Besides teaching and research, Tobin was also strongly involved in the public life, writing on current economic issues and serving as an economic expert and policy consultant. During 1961–62, he served as a member of John F. Kennedy’s Council of Economic Advisors, under the chairman Walter Heller, then acted as a consultant between 1962–68. Here, in close collaboration with Arthur Okun, Robert Solow and Kenneth Arrow, he helped design the Keynesian economic policy implemented by the Kennedy administration. Tobin also served for several terms as a member of the Board of Governors of Federal Reserve System Academic Consultants and as a consultant of the US Treasury Department. James Tobin was awarded the John Bates Clark Medal in 1955 and, in 1981, the Nobel Memorial Prize in Economics. He was a fellow of several professional associations, holding the position of president of the American Economic Association in 1971. In 1972 James Tobin, along with fellow Yale economics professor William Nordhaus, published Is Growth Obsolete?, an article that introduced the Measure of Economic Welfare as the first model for economic sustainabilityassessment, and economic sustainability measurement. In 1988 Tobin formally retired from Yale, but continued to deliver some lectures as Professor Emeritus and continued to write. He died on March 11, 2002, in New Haven, Connecticut. Tobin was a trustee of Economists for Peace and Security.