D.E.A. Mathématiques appliquées à l'Économie, Université Paris IV, 1971
D.E.S. Sciences Économiques, Université Paris , 1971
École Nationale de la Statistique et de l'Administration Économique ENSAE, 1970
École Polytechnique, 1965
Guy is a Research Fellow at the IFS and was involved with the Mirrlees Review of the UK tax system. He is also a Professor at Sciences Po and at University College London. Guy is head of the Macroeconomics Laboratory at CREST, the research centre of the French statistical agency INSEE. His research revolves around macroeconomic issues, with contributions to theory, econometric techniques and applications.