Fyodor Mikhailovich Dostoevsky (November 11 [O.S. October 30] 1821 – February 9 [O.S. January 28] 1881) is considered one of two greatest prose writers of Russian literature, alongside close contemporary Leo Tolstoy. Dostoevsky's works have had a profound and lasting effect on twentieth-century thought and world literature. Dostoevsky's chief ouevre, mainly novels, explore the human psychology in the disturbing political, social and spiritual context of his 19th-century Russian society. Considered by many as a founder or precursor of 20th-century existentialism, his Notes from Underground (1864), written in the anonymous, embittered voice of the Underground Man, is considered by Walter Kaufmann as the "best overture for existentialism ever written." Source: Wikipedia