Charles Jean de la Vallée Poussin
Belgian mathematician
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Charles-Jean Étienne Gustave Nicolas, baron de la Vallée Poussin was a Belgian mathematician. He is best known for proving the prime number theorem.
The King of Belgium ennobled him with the title of baron. Wikipedia
Born: August 14, 1866, Leuven, Belgium
Died: March 2, 1962 (age 95 years), Watermael-Boitsfort, Belgium
Award: Poncelet Prize (1916)
Known for: Poussin graph; Poussin summability; Poussin theorem; Prime number theorem