Rachel Riley
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Rachel Annabelle Riley (born 11 January 1986) is an English television presenter and mathematician who currently co-presents the Channel 4 daytime puzzle show Countdown and its comedy spin-off 8 Out of 10 Cats Does Countdown. A mathematics graduate, her television debut came when she joined Countdown at age 22.

With a passion for popularising maths and the sciences, she has gone on to co-present The Gadget Show on Channel 5 (2013–14) and It's Not Rocket Science on ITV (2016). In 2013 she was a contestant on the BBC celebrity dance show Strictly Come Dancing.

Born in Rochford, Essex, to an accountant father Christopher and Celia, she has a younger brother, Alex. Riley was brought up in the Thorpe Bay area of Southend-on-Sea and was educated at the independent Thorpe Hall School, and Southend High School for Girls, a grammar school, where she obtained four As at A-Level. She then studied mathematics at Oriel College, Oxford, gaining an upper second-class honours degree.