architect of the “German Expressionist school,” noted for the huge reinforced concrete dome of his Jahrhunderthalle (Centenary Hall; 1912–13) at Breslau (now Wrocław, Pol.). Berg studied at Technische Hochschule, Berlin. He was city architect for Breslau from 1912 to 1913. Also at Breslau he designed the Exhibition Hall Messehof and the hydroelectric station. By 1925 he had abandoned architecture to devote himself to Christian mysticism.