Enrico Bombieri
Enrico Bombieri (1940 - ) Italian mathematician, best known for the Bombieri-Vinogradov theorem regarding the measure of error in Dirichlet’s theorem on arithmetic progressions, thought to be one possible direction towards proving the Riemann hypothesis
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(so much so that the Clay Mathematics Institute asked Bombieri to write the official description for the Millennium Problems). Bombieri was awarded the Fields medal in 1974.