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. 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. 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. Early life and education Mary Jacqueline Tyrwhitt was born in Pretoria, South Africa to Thomas Tyrwhitt and Jaqueline Frances Otter. In Pretoria her father worked as an architect in the public Works Department where he designed public buildings as part of the reconstruction effort after the Boer War of 1899-1902. After the conclusion of a two-year posting in Pretoria the family relocated to Hampstead, north of London. In 1918, she won a scholarship to attend the St Paul's Girls' School, Hammersmith. Before War Although Jacqueline wanted to pursue a history scholarship at Oxford, her father did not allow her. Instead, she prepared for the general horticultural examination of the Royal Horticultural Society, which she passed with high marks in March 1924. The following September she was among eight women in a group of 30 students who comprised the first-year class at the Architectural Association (AA) which at that time still followed traditional Beaux Arts principles and methods. In mid-1926 she took a job working for a small firm of "garden architects" in her London neighbourhood and was also enrolled in an evening course at the London School of Economics. Interwar Work and Professional Development Tyrwhitt spent the first nine months of 1937 studying town planning and land settlement at the Technische Hochschule in Berlin (TH-Berlin). Back in England Tyrwhitt enrolled in the SPRRD, graduating with honours in 1939. In later reflections on the experience she said she had wanted to experience life under a