Tenement house reform, New York, N.Y., 1892-1902; City Club and municipal reform, 1903-1906; national movement for housing reform; Hoover Housing Conference, 1931-1932; zoning and city planning; initiation of permanent population data in sample New York, N.Y. blocks; traffic control and rapid transit problems; reforms in New York, N.Y. courts: Magistrate's, Children's and Domestic Relations; record s systems. Relations with Mayors George McClellan, William Gaynor, and John Hylan, and others