Eugene O'Neil was an American playwright who won the Nobel Prize for Literature in 1936. He is best known for his plays such as 'Long Day's Journey Into Night' and 'The Iceman Cometh'. He was one of the first playwrights to explore the psychological depths of his characters and to use symbolism in his works. His plays are still performed today and he is considered one of the most influential American playwrights of the 20th century.