Began as town planner of the City of Berlin-Weissensee, 1910. With City of Hamburg, 1910-1912. Chairman building department, City of Wilhelmshaven, 1911-1914.
Chief of planning bureau, City of Berlin, 1914-1918, chairman building department, 1926-1933. Organizer German Building Guilds, 1920-1926. Professor housing, regional planning, Harvard, 1938-1950, professor emeritus since 1950.