Grigory Isaakovich Barenblatt was a Russian mathematician.
Grigory Barenblatt
Andrey Nikolaevich Kolmogorov was a Soviet mathematician who contributed to the mathematics of probability theory, topology, intuitionistic logic, turbulence, classical mechanics, algorithmic information theory and computational complexity.
Andrey Kolmogorov
Kolmogorov (left) delivers a talk at a Soviet information theory symposium. (Tallinn, 1973).
Kolmogorov works on his talk (Tallinn, 1973).