Sir Raymond Unwin (1863-1940) was one of the best-known pioneers of town planning. Inspired by Willian Morris and Fabianism he designed new prototypes for working class housing. The design of 20th-century housing, new suburbs and new towns perhaps owes more to Unwin, and to the works in Letchworth, New Earswick and Hampstead Garden Suburb than to any other individual. This biography is both an appreciation of his life and a critical study of his works. Though centred on his British planning activities, it also deals with his role in international planning, particularly in North America, and his place at the foundations of the town Planning Institute and the heart of the architectural profession.