Ivan Gubkin

Russian Soviet geologist

Ivan Mikhailovich Gubkin (Russian: Ива́н Миха́йлович Гу́бкин; 21 September [O.S. 9 September] 1871 – 21 April 1939) was a Russian and Soviet geologist and president of the 1937 International Geological Congress in Moscow. He was a petroleum geologist particularly interested the region between the Volga and the Urals.²

From Wikipedia’s article on Ivan Gubkin (this version), CC BY-SA 4.0.

Born Sep 21, 1871, died Apr 21, 1939.¹