\u00c9cole Normale Sup\u00e9rieure alumni

Michel Lejeune (30 January 1907 – 27 January 2000) was a French linguist, a specialist in the sound changes of Ancient Greek. He was a member of the Académie des inscriptions et belles-lettres.

Jean-Pierre Kahane (11 December 1926 – 21 June 2017) was a French mathematician with contributions to harmonic analysis.

Claude Hagège (French: [aʒɛʒ]; born 1 January 1936) is a French linguist.

Jean-Baptiste Duroselle (17 November 1917, Paris – 12 September 1994, Arradon) was a French historian and professor. He had initially considered an army career or study of geography, but his poor skills in mathematics and drawing led him to turn to historical study. Pierre Renouvin's course fascinated him, and he became his assistant in 1945. He went on to teach at University of Saarbrücken from 1950 to 1957 and returned to the Sorbonne afterward. Between 1977 and 1979, he was visiting professor of the history of international relations at the Graduate Institute of International Studies in Geneva. Duroselle's writings include La Decadence (1980), L'Abime (1985), and others. Duroselle was elected to the American Philosophical Society in 1975. He was noted for his study of international relations and won a 1982 Balzan Prize for Social Sciences for his work.Among his students was Élisabeth Du Réau, biographer of Édouard Daladier. He supervised her 1987, eight-volume thesis on Daladier, published in condensed form in 1993 as Édouard Daladier, 1884-1970.

Adrien Douady (French: [adʁijɛ̃ dwadi]; 25 September 1935 – 2 November 2006) was a French mathematician born in La Tronche, Isère. He was the son of Daniel Douady and Guilhen Douady.Douady was a student of Henri Cartan at the École normale supérieure, and initially worked in homological algebra. His thesis concerned deformations of complex analytic spaces. Subsequently, he became more interested in the work of Pierre Fatou and Gaston Julia and made significant contributions to the fields of analytic geometry and dynamical systems. Together with his former student John H. Hubbard, he launched a new subject, and a new school, studying properties of iterated quadratic complex mappings. They made important mathematical contributions in this field of complex dynamics, including a study of the Mandelbrot set. One of their most fundamental results is that the Mandelbrot set is connected; perhaps most important is their theory of renormalization of (polynomial-like) maps. The Douady rabbit, a quadratic filled Julia set, is named after him.
Douady taught at the University of Nice and was a professor at the Paris-Sud 11 University, Orsay. He was a member of Bourbaki and an invited speaker at the International Congress of Mathematicians in 1966 at Moscow and again in 1986 in Berkeley.
He was elected to the Académie des Sciences in 1997, and was featured in the French animation project Dimensions.
He died after diving into the cold Mediterranean from a favourite spot near his vacation home in the Var.
His son, Raphael Douady, is also a noted mathematician and an economist.

Alain Etchegoyen (6 November 1951 in Lille – 9 April 2007 in Le Mans), was a philosopher and novelist. He was the last Plan Commissionner before that Commission was abrogated. He wrote some twenty books, essays and novels.
A former student of l'École Normale Supérieure, he was a professor in classes prépas at the Lycée Louis-le-Grand, and in a professional lycée in Hauts-de-Seine.

François Cusset (French: [kysɛ]; born 9 March 1969) is a writer, intellectual historian, and Professor of American Civilisation at the University of Nanterre.
Cusset was a student at the Ecole Normale Superieure de Saint-Cloud. He has been an associate researcher at The National Center of Scientific Research (Centre national de la recherche scientifique or CNRS), teacher of contemporary French culture at Reid Hall, and professor at the Institut d'Études Politiques de Paris. He is the brother of the writer Catherine Cusset.

Jean-Charles Naouri (born 8 March 1949) is a French businessman. He is chairman, chief executive officer and controlling shareholder of Groupe Casino.

Henri Berestycki (born 25 March 1951) is a French mathematician who obtained his PhD from Université Paris VI – Pierre and Marie Curie University in 1975. His Dissertation was titled Contributions à l'étude des problèmes elliptiques non linéaires, and his doctoral advisor was Haïm Brezis. He was an L.E. Dickson Instructor in Mathematics at the University of Chicago from 1975–77, after which he returned to France to continue his research. He has made many contributions in nonlinear analysis, ranging from nonlinear elliptic equations, hamiltonian systems, spectral theory of elliptic operators, and with applications to the description of mathematical modelling of fluid mechanics and combustion. His current research interests include the mathematical modelling of financial markets, mathematical models in biology and especially in ecology, and modelling in social sciences (in particular, urban planning and criminology). For these latter topics, he obtained an ERC Advanced grant in 2012.
He worked at the French National Center of Scientific Research (CNRS), then moved to an appointment as Professor at University Paris XIII (1983–1985). He became a Professor of Mathematics in 1988 at Université Pierre et Marie Curie, Paris VI (1988–2001 of “exceptional class” since 1993), and became professor at École normale supérieure, Paris (1994–1999), and part-time professor at the École Polytechnique (1987–1999). He is also a visiting Professor in the Department of Mathematics at the University of Chicago, and was also co-director of the Stevanovich Center of Financial Mathematics in Chicago. He is currently the Directeur d'études (Research Professor) at École des hautes études en sciences sociales (EHESS), since 2001.

Martin Hirsch (born 6 December 1963 in Suresnes) is a French civil servant who was the former head of Emmaüs France, the former High Commissioner for Active Solidarity against Poverty, and the High Commissioner for Youth in the government of François Fillon. Hirsch was in charge of setting up the Revenu de solidarité active and left the government in March 2010 to head the state's Civic Service Agency.Hirsch holds a master's degree in Neurobiology and is an alumnus of the École Normale Supérieure and of the École Nationale d'Administration.
He is married to Florence Noiville.