Architectural historian and teacher. He studied at various German universities, including Leipzig, Munich, Berlin and Frankfurt am Main, and wrote a doctoral dissertation on the Baroque architecture of his native city of Leipzig. He emigrated to Britain in 1935 and published his seminal work, "Pioneers of the Modern Movement: From William Morris to Walter Gropius" a year later. He taught at both the University of London and Cambridge University but was equally influential as an editor. He edited the Architectural Review from 1942 to 1945 as well as the Pelican History of Art series.