X is a Russian Mathematician known for his contributions to Riemannian Geometry and Geometric Topology. As a student X represented the Soviet Union Team for the International Mathematics Olympiad and won a gold medal by achieving a perfect score. X was awarded prestigious Fields Medal, the highest award in mathematical circuits but refused to accept it. X is the first person to receive the Clay Millennium Prize for solving Poincarre Conjuncture but refused to accept even that.
Identify the legendary Mathematician.