Marian Rejewski

Polish mathematician and cryptologist (1905–1980).

Born August 16th, 1905 in Bydgoszcz. [ref]

Died February 13th, 1980 at 74 years old in Warsaw (myocardial infarction).

Occupations
cryptologist, inventor, mathematician
Wikipedia

Mostly it is loss which teaches us about the worth of things. Arthur Schopenhauer