What is the author's style in The Hairy Ape by Eugene O'Neill?

The Hairy Ape is often categorized as expressionist theater. O'Neill's writing did not exclusively center on this style—in fact, only a handful of the playwright's work fits the definition of expression-istic theater. Dramatic expressionism is a theatrical movement that is largely credited to August Strindberg (author of Miss Julie and a significant influence on O'Neill) Within this genre, a playwright can show a very subjective viewpoint on life, one that can be interpreted on a number of levels (which explains why The Hairy Ape has variously been viewed as both pro-socialist propaganda and anti-socialist criticism).