Who's Mikhail Tetyaev? A Russian to beat.

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Mikhail Mikhailovich Tetyaev (Russian: Михаил Михайлович Тетяев; 11(23) September 1882, Nizhny Novgorod – 11 October 1956, Leningrad) was a Soviet tectonic geologist.

The wrinkle ridge Dorsa Tetyaev on the Moon is named after him.^[1]