Jaqueline Tyrwhitt, a British town planner, editor, and educator who was at the center of the group of people who shaped the postwar Modern Movement played a central role in Twentieth Century design history and yet her contributions to planning and urban design education and practice, mapping, CIAM discourse are largely unacknowledged. This intellectual biography not only details these landmark contributions, working alongside Geddes, Sert, Giedion and Doxiadis, but also indicates their relevance for contemporary scholars and practitioners, particularly those concerned with 'healthy' community.