Andrey Kolmogorov
Andrey Nikolaevich Kolmogorov (, 25 April 1903 – 20 October 1987) was a Soviet mathematician and computer scientist. He made major advances in the fields of probability theory and topology. Born in a Russian family in Tambov, he worked early in his career on intuitionistic logic, and Fourier series. He also worked on turbulence, classical mechanics, and information theory; and was a founder of algorithmic complexity theory which is often referred to as simply Kolmogorov complexity theory.