John Geanakoplos (b. 1955) received his B.A. in Mathematics from Yale University in 1975 (summa cum laude), his M.A. in Mathematics and his Ph.D. in Economics under Kenneth Arrow and Jerry Green from Harvard University in 1980. He started as an Assistant Professor in Economics at Yale University in 1980, becoming an Associate Professor in 1983, Professor in 1986, and the James Tobin Professor of Economics in 1994. From 1996-2005 he was Director of the Cowles Foundation for Research in Economics. He was a co-founder in 1992, and is still currently co-director, of the Hellenic Studies Program at Yale. He was elected a fellow of the Econometric Society in 1990 and of the American Academy of Arts and Sciences in 1999. He was awarded the Samuelson Prize in 1999, and was awarded the first Bodossaki Prize in economics in 1994 (for the best economist of Greek heritage under 40). In 1990-1991 and again in 1999-2000 he directed the economics program at the Santa Fe Institute, where he remains an external professor and chairman of the science steering committee. He spent terms as visiting professor at MSRI in the University of California, Berkeley, at Churchill College, Cambridge, at the University of Pennsylvania, at Harvard, at Stanford, and at MIT. From 1990-1994 he was a Managing Director and Head of Fixed Income Research at Kidder, Peabody & Co. He was one of the founding partners in 1995 of Ellington Capital Management, where he remains a partner. In 1970 he won the United States Junior (< 20) Open Chess Championship. One of his current research topics is the leverage cycle.