Rosi Sexton
Rosi Sexton
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Rosi Sexton

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Rosi Sexton

Rosemary Ann Sexton (born 16 July 1977) is a British politician, mathematician, sports therapist, osteopath, and former mixed martial artist.

Sexton obtained a degree in mathematics from the University of Cambridge in 1998, before later obtaining a Master of Science in mathematical logic in 2000 from the University of Manchester and eventually a PhD in theoretical computer science. She began her professional mixed martial arts (MMA) career in 2002, becoming the first Cage Warriors Women's 132 lbs Champion in 2005 in addition to becoming the first British woman to fight in the Ultimate Fighting Championships (UFC) in 2013. She retired from MMA in 2014.

A member of the Green Party of England and Wales, Sexton was elected as a councillor in the Shirley West ward of the Solihull Metropolitan Borough Council in 2019. In 2020, she ran in the Green Party leadership election and came second.

Sexton was born in Versailles, France but moved to Britain at a young age, and grew up and received her education in the United Kingdom. She attended Kendrick School, Reading. Her father commented "what consistently runs through Rosi's life is winning: she has a need to win. Her physics teacher said ‘Rosi has a meticulous approach to her studies and nothing short of perfection satisfies her' ".

Sexton was a musician and played with the Reading Youth Orchestra while at school (from 1991 to 1995). She reached grade 7 in cello and grade 8 in piano, then became an Associate of the London College of Music Examinations (piano). In November 1994, aged 17, she played in the Royal Albert Hall, with the Reading Youth Orchestra. She also played the organ ("though I never got very good").

In 1995, Sexton was admitted to Trinity College, Cambridge, where she took a first class degree in mathematics (1998). Her tutor in mathematics was Tim Gowers.[citation needed] She preferred pure maths: her particular interests were logic, combinatorics and number theory. She then moved to the University of Manchester, where she achieved a Master of Science (MSc) degree in mathematical logic in 2000. She went on to complete a PhD in theoretical computer science. Her supervisor was Harold Simmons who held a joint position in the School of Mathematics and the Department of Computer Science, with whom she wrote two papers Point-sensitive and point-free patch constructions. and An ordinal indexed hierarchy of separation properties.

In May 2019, Sexton was elected as a Green Party councillor in the Shirley West ward of the Solihull Metropolitan Borough Council. In the same election, her partner Stephen Caudwell was elected as Green Party councillor for the Castle Bromwich ward. She ran in Solihull as a parliamentary candidate in the 2019 general election, losing to Julian Knight and coming in fourth with 3.7% of the vote.

On 28 June 2020, it was announced that Sexton would stand as a candidate in the Green Party of England and Wales leadership election. The results were announced on 9 September 2020: Sexton came second, beaten by incumbent leaders Jonathan Bartley and Siân Berry.

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