Rosi Sexton

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' ".

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 is also running in Solihull as a parliamentary candidate in the 2019 general election.

In 2018, aged 41, she was promoted to black belt in BJJ by Paul Rimmer.

After retiring from MMA in 2014, Sexton did more climbing. On 27 July 2017, shortly after her 40th birthday, she and Stephen Caudwell climbed the highest artificial climbing wall in the world, Luzzone Dam, in Switzerland. The climb was sponsored for the benefit of the Mind charity. After successfully completing the climb, Sexton and Caudwell became engaged. There is an account of the climb, and some videos on YouTube.

On 21 June 2014, Sexton announced her retirement from MMA competition.

Sexton moved up in weight to make her UFC debut in Winnipeg, Manitoba, Canada on the UFC 161 card against Alexis Davis on 15 June 2013. Sexton lost the fight by unanimous decision (29–28, 29–27, and 29–28).

On 26 October 2013, Sexton returned to the Octagon and faced Jéssica Andrade at UFC Fight Night 30. She lost the fight via unanimous decision (30–26, 30–27, and 30–26). Sexton was released from the promotion shortly after the fight.

On 2 June 2012, Sexton faced Aisling Daly at Cage Warriors Fighting Championship 47. The bout was part of a tournament to crown a Cage Warriors 125-pound women's champion. Sexton defeated Daly by unanimous decision to advance to the tournament final.

Sexton was scheduled to face Sheila Gaff in the finals at Cage Warriors Fighting Championship 49 on 27 October 2012 in Cardiff, Wales. Voluntary Anti-Doping Association (VADA) drug testing was used in the weeks prior to the planned fight. However, the bout was cancelled on 19 October when Gaff withdrew due to illness.

Sexton faced Roxanne Modafferi at Cage Warriors Fighting Championship 40 on 26 February 2011. She defeated Modafferi by unanimous decision.

Sexton was scheduled to face Sheila Gaff at Cage Warriors Fighting Championship 43 on 9 July 2011 for the Cage Warriors Women's Super Flyweight Championship at 125 pounds. However, she suffered a concussion during training and was forced to withdraw from the fight.

At the same time, she trained in osteopathy, receiving a degree in that subject from Oxford Brookes University in 2010. She currently practices as an Osteopath in the Birmingham (Solihull) area, with a particular interest in sports injuries and evidence-based practice. She has written about the problem of performance-enhancing drugs (doping) in combat sports, and is a supporter of the Voluntary Anti-Doping Association, VADA. She is a spokesperson for SafeMMA, an organisation dedicated to ensuring safety of competitors, and she runs a combat sports injury clinic.

Sexton was scheduled to face Angela Magaña at CWFC 37: Right To Fight on 22 May 2010, but Magana suffered an injury and Sexton was matched against Emi Fujino. However, due to Sexton's re-signing with Bellator, her CWFC fight was cancelled.

Sexton returned to face Sally Krumdiack at Cage Warriors Fighting Championship 39 on 27 November 2010 in Cork, Ireland. She won via TKO in the second round.

Following the demise of Elite XC, Sexton debuted for Bellator Fighting Championships at Bellator 12 on 19 June 2009. She submitted Valerie Coolbaugh with an armbar in the first round.

Sexton signed an exclusive three-fight contract with Elite XC in June 2008. She faced Debi Purcell at the 15 August 2008 ShoXC event in Friant, California and defeated Purcell by split decision.

On 17 February 2007, Sexton faced Japanese striker "Windy" Tomomi Sunaba at a BodogFight event in Costa Rica. Sexton won the fight by Technical Decision in the second round after Sunaba suffered a serious ankle injury.

Sexton fought once more for BodogFight and submitted Julia Berezikova on 24 August 2007.

Sexton debuted for BodogFight on 16 December 2006 and upset Brazilian submission specialist Carina Damm with an armbar late in the first round.

Sexton made her mixed martial arts debut on 11 May 2002. She won her first five fights before moving up in weight to face Gina Carano on 15 September 2006. Sexton was defeated by knockout late in the second round.

Sexton had been involved in martial arts since she was at school. She already held dan grades in jujutsu and Taekwondo. In 2000, after 10 years' experience in martial arts, she decided to train in Mixed Martial Arts and Brazilian Jiu-Jitsu, as a way of proving to herself that what she had learned was applicable to real life. A clue to the reason for this career change may be found in her comment "The other things I did, the music, the maths, just weren't quite hard enough"

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. 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. The first of these papers has eight citations -good for such esoteric mathematics. Sexton's academic interests have been discussed in an interview by David Colquhoun.

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").

Rosemary Ann Sexton (born 16 July 1977) is a British mathematician, athlete, sports therapist, osteopath, writer and musician. She had a career in mixed martial arts (MMA), from which she retired in 2014.