Rachel Riley is the numbers expert on Channel 4's long-running quiz show Countdown, having taken over the helm from Carol Vorderman in January 2009.
In February 2010 Rachel appeared in the Channel 4 Dispatches programme Kids Don't Count. The two-part documentary asked how and why we are failing Britain's children when it comes to maths. Rachel visited a primary school in Bristol to help encourage the children to tackle their maths demons.
Rachel has also been invited by Channel 4 to chair a debate regarding maths in schools, which linked to the Dispatches documentary Kid's Don't Count. She chaired a panel of three experts, including J Sainsbury's CEO, Justin King.
In July 2010 Rachel appeared in a cameo role in Channel 4's series The IT Crowd entitled 'The Final Countdown' (Series 4 Episode 2).
Brought up in Thorpe Bay, Essex, Rachel Riley graduated from Oriel College Oxford with an upper second-class honours degree in Mathematics, covering Quantum Theory, Fluid Mechanics and Applied Maths and was made a scholar in 2006. She captained the Oriel College Netball team and played in the women's football team.
After graduating Rachel began work as a data analyst for a website company in London. She was encouraged to apply for the Countdown position by her mother, and didn't have any ambition to be a television presenter, but decided to apply because she was interested in the numbers part of the game. Rachel was chosen from more than a thousand applicants despite having no previous television experience.
In 2009, Rachel was recruited by the Post Office, employing her mathematical skills to help advise holidaymakers on how to make the most of their holiday currency, after a report by the Post Office revealed that a significant number of holidaymakers fail to calculate the actual cost of goods and services when travelling abroad and often overspend their holiday budget.
Rachel is an avid Manchester United fan and in January 2012 she took part in Celebrity Mastermind, with her topic of choice being Manchester United from 1999 onwards. In March 2012 she won the celebrity edition of The Bank Job.