Berény is best known for his form of expressionism and cubism, which he developed in association with the avant-garde group known as The Eight, who had their first exhibit together in Budapest in 1909. They included the leader Károly Kernstok, Lajos Tihanyi, Béla Czóbel, Dezső Czigány, Ödön Márffy, Dezső Orbán, and Bertalan Pór. He brought to them French influences from his time in Paris.