Grigori Perelman

Grigori Perelman is a brilliant mathematician best known for his proof of the Poincaré Conjecture, one of the seven Millennium Prize Problems. By using Ricci flow with surgery, he was able to classify three-dimensional manifolds, a feat that had eluded mathematicians for decades. Perelman's work is characterized by its extreme depth and originality. His decision to decline both the Fields Medal and the Millennium Prize brought him global attention, but his mathematical contributions remain his most lasting legacy.

His proof is a landmark in the history of topology and geometry, demonstrating the power of modern analytical methods.