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Grigori Perelman

Russian mathematician
Grigori Yakovlevich Perelman is a Russian mathematician who is known for his contributions to the fields of geometric analysis, Riemannian geometry, and geometric topology. Wikipedia
Born: 1966 (age 57 years), Saint Petersburg, Russia
Known for: Proof of the soul conjecture; Proof of the Poincaré conjecture and geometrization of 3-manifolds
Doctoral advisor: Aleksandr Aleksandrov; Yuri Burago
Thesis: Saddle Surfaces in Euclidean Spaces (1990)