This book documents the life and work of Clarence Samuel Stein, an environmental designer, humanist, houser, policymaker, town planner, and regionalist whose influential career stretched from the Progressive era of urban reform through the post–World War II era of postcolonial international planning. Looking through the lens of Stein's lifework, the book explores emerging concepts in site design, housing finance and management, town building, regional development, and community planning. It considers four critical themes that informed Stein's career and legacy: his collaborative approach, promotion and implementation of “investment housing,” distinctive interrelated community design epitomized as the Radburn Idea, and his advocacy of communitarian regionalism. These themes are tied together by the concept of the Garden City as introduced by Ebenezer Howard and implemented first most notably by architects Raymond Unwin and Barry Parker. This introduction provides an overview of Stein's projects and initiatives as well as the chapters that follow.