|Born||1 May 1937|
|Died||18 September 2017 (aged 80)|
Imison was educated at Somerville College, Oxford. After having a family of three, she went into teaching science in 1972 and taught for nearly 30 years. Between 1984 and 2000, she was Headteacher of the Hampstead School in north London. Imison wrote, researched and lectured on numerous topics related to academia, including Leadership, ICT, Comprehensive Schooling, Creativity, Learning, Schools of the Future, Post 16 and Women Leaders.
She retired in 2005 to Halesworth Suffolk. There she devoted a large part of her time improving the natural environment in the town. She helped found and run 'Halesworth in Bloom' achieving her goal of becoming best small town in 2015. She also helped the park gain green flag status and created a new Hooker Trail within to celebrate the famous botanist Sir Joseph Dalton Hooker who once lived in Halesworth. In June 2017, she organized a weekend long celebration of his bicentenary.
Dame Tamsyn died of cancer, aged 80.
- Smith, Amy (5 October 2017). "Tributes paid to Halesworth heroine who worked tirelessly to promote town's unique beauty". Beccles and Bungay Journal. Retrieved 14 July 2018.