Person: Yoccoz, JeanChristophe
JeanChristophe Yoccoz was a French mathematician who was awarded a Fields Medal in 1994 for his work on dynamical systems.
Mathematical Profile (Excerpt):
 Yoccoz did his military service in Brazil in 19811983.
 As a student of Herman, a leading word expert on dynamical systems, it was not surprising that Yoccoz would himself work on dynamical systems.
 However, it was remarkable how quickly Yoccoz was to establish himself as the most brilliant researcher in this area.
 In his thesis, Yoccoz improved theorems of his supervisor Herman by giving simpler proofs but also obtaining the same results under weaker hypotheses.
 At the International Congress of Mathematicians in Zürich in 1994, Yoccoz received his greatest honour for this work on dynamical systems when he was awarded a Fields Medal.
 After Poincaré, the theory was developed by a large number of mathematicians such as Arnold, Fatou, Herman, Julia, Kolmogorov, Palis, Siegel, Smale and Yoccoz.
Born 29 May 1957, Paris, France. Died 3 September 2016, Paris, France.
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Prize Fields Medal
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References
Adapted from other CC BYSA 4.0 Sources:
 O’Connor, John J; Robertson, Edmund F: MacTutor History of Mathematics Archive