Mary Jaqueline Tyrwhitt (25 May 1905 – 21 February 1983) was a British town planner, journalist, editor and educator. She was at the centre of the transnational network of theoreticians and practitioners who shaped the post-war Modern Movement in decentralized community design, residential architecture and social reform. She contributed in developing methods for the application of the ideas of Patrick Geddes, as well as publicizing them.[1][2] Even Tyrwhitt had never met Geddes, she was able to extract from his many writings key ideas and concepts to disseminate among her colleagues and injected Geddesian thinking into conferences, discussions, curricula, publications, and policy documents.[2]
In the 1950s she was a professor at the University of Toronto, where she helped establish a graduate program in city and regional planning and then in 1955 moved to the Harvard Graduate School of Design in the Department of City Planning and Landscape Architecture, where she taught for many years until her retirement.[3]