Fyodor Dostoyevsky was a Russian author of realist fiction and essays. He is well known for his stories Crime and Punishment, The Idiot and The Brothers Karamazov. Dostoyevsky's literary books explored human psychology in the troubled political, social and spiritual context of 19th-century Russian society. Considered by many as a founder or precursor of 20th-century existentialism, Dostoyevsky created, with the embittered voice of the anonymous underground man, Notes from Underground (1864), which was named the best overture for existentialism ever written by Walter Kaufmann. Dostoyevsky is often acknowledged by critics as one of the greatest and most prominent psychologists in world literature.