Lev Isaakovich Shestov (Russian: Лев Исаа́кович Шесто́в), born Yehuda Leyb Schwarzmann (Russian: Иегуда Лейб Шварцман), variously known as Leon Shestov, Léon Chestov, Leo Shestov.
A Ukrainian/Russian existentialist philosopher. Born in Kiev (Russian Empire). He emigrated to France in 1921, fleeing from the aftermath of the October Revolution. He lived in Paris until his death.