O'Neill Work is a term used to refer to the works of American playwright Eugene O'Neill. He is best known for his plays, which often focus on the struggles of the human condition. His most famous works include the DRAMA 'Long Day's Journey Into Night' and the PLAY 'The Iceman Cometh'. He also wrote several one-act plays, such as 'Ile' and 'Where the Cross is Made'. O'Neill's works are considered some of the most important in American theatre history.