Jean-Christophe Yoccoz

Jean-Christophe Yoccoz

Jean-Christophe Yoccoz
Born (1957-05-29)May 29, 1957
Paris, France
Died September 3, 2016(2016-09-03) (aged 59)
Nationality French
Fields Mathematics
Alma mater École Normale Supérieure
École Polytechnique
Paris-Sud 11 University
Collège de France
Doctoral advisor Michael Herman
Doctoral students Sylvain Crovisier
Ricardo Pérez-Marco
Known for Dynamical systems
Yoccoz puzzle
Notable awards Salem Prize (1988)
Fields Medal (1994)

Jean-Christophe Yoccoz (May 29, 1957 – September 3, 2016) was a French mathematician. He was awarded a Fields Medal in 1994, for his work on dynamical systems.[1][2]


Yoccoz attended the Lycée Louis-le-Grand,[3] during which time he was a silver medalist at the 1973 International Mathematical Olympiad and a gold medalist in 1974.[4][5] He entered the École Normale Supérieure in 1975, and completed an agrégation in mathematics in 1977.[6] After completing military service in Brazil, he completed his Ph.D. under Michael Herman in 1985 at the École Polytechnique.[6][7][8] He took up a position at the University of Paris-Sud in 1987, and became a professor at the Collège de France in 1997, where he remained until his death.[2] He was a member of Bourbaki.[9]

Yoccoz won the Salem Prize in 1988. He was an invited speaker at the International Congress of Mathematicians in 1990 at Kyoto,[10] and was awarded the Fields Medal at the International Congress of Mathematicians in 1994 in Zürich.[11][10] He joined the French Academy of Sciences and Brazilian Academy of Sciences in 1994, became a chevalier in the French Legion of Honor in 1995, and was awarded the Grand Cross of the Brazilian National Order of Scientific Merit in 1998.[5]

Mathematical work

Yoccoz's worked on the theory of dynamical systems, his contributions include advances to KAM theory, and the introduction of the method of Yoccoz puzzles, a combinatorial technique which proved useful to the study of Julia sets.[5]


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