Johannes Schlaf was a German playwright, author, and translator and an important exponent of Naturalism. As a translator he was important for exposing the German-speaking world to the works of Walt Whitman, Émile Verhaeren and Émile Zola and is known as a founder of the "Whitman Cult" in Germany. His literary achievements lie foremost in the scenic-dialogue innovations of "sequential naturalism" and in the formalization of literary impressionism. He also contributed to the emergence of the "intimate theater."