Grigori Yakovlevich Perelman (Russian: ???????? ????????? ?????????, IPA: [gr??'gor??j 'jak?vl??v??t? p??r??l?'man] (listen); born 13 June 1966) is a Russian mathematician.
He has made contributions to Riemannian geometry and geometric topology.
In 1994, Perelman proved the soul conjecture.
In 2003, he proved Thurston's geometrization conjecture.