Clarence S. Stein was an American urban planner, architect, writer, and a major proponent of the Garden City movement in the United Sates. Stein co-founded the Regional Planning Association of America which addressed major planning issues such as affordable social housing, the effects of suburbanization, and wilderness preservation. Stein's most renowned works include his plans for Radburn, Sunnyside Gardens, Greenbelt, and Village Green. Stein's legacy is one of progressive experimental architecture and planning intended to create a built environment to serve social as well as individual goals.