otisaardvark writes "The 2006 Fields medals, awarded every four years and described as the Nobel Prize for Mathematics, have been awarded at the International Congress of Mathematicians. The winners are Grigory Perelman (famous for the ideas underlying the proof of the Poincare and Thurston geometrization conjectures) — who declined the prize, Terence Tao (a child prodigy famous for proving there are arbitrarily long arithmetic progressions of primes, but who works mainly in nonlinear partial differential equations and harmonic analysis), Wendelin Werner (a probabilist working on links with 2D conformal field theories), and Andrei Okounkov (who works on the interface between algebraic geometry and physics)." Yours Truly
wrote to mention that Grigory Perelman actually refused his Fields Medalist
, on the grounds that he 'doesn't want to be seen as a figurehead'.