Well known for his column in MDULThe New YorkerMDNM and his visionary political and ecological ideas, Lewis Mumford is widely regarded as one of the foremost urban critics of the century. Mumford's work, which spanned from the 1920s through the 1960s, addressed the environmental, aesthetic, and social dimensions of American culture. Clearly a man ahead of his time, he advanced a conception of regional development that balanced the needs of the social world with those of the natural ecosystem. This book first traces the development of his ideas and his work as founder of the Regional Planning Association of America (RPAA), and then explores the relevance of Mumford's vision to today's urban and environmental problems.