Simon Lehna Singh, MBE (born 19 September 1964) is a British popular science author, theoretical and particle physicist.

His written works include Fermat's Last Theorem (in the United States titled Fermat's Enigma: The Epic Quest to Solve the World's Greatest Mathematical Problem),[6][7] The Code Book[8] (about cryptography and its history), Big Bang[9] (about the Big Bang theory and the origins of the universe), Trick or Treatment?

[11] In 2012 Singh founded the Good Thinking Society,[12] through which he created the website "Parallel" to help students learn mathematics.

Singh has also produced documentaries and works for television to accompany his books, is a trustee of the National Museum of Science and Industry, a patron of Humanists UK, founder of the Good Thinking Society, and co-founder of the Undergraduate Ambassadors Scheme.

[17] In 1990 Singh returned to England and joined the BBC's Science and Features Department, where he was a producer and director working on programmes such as Tomorrow's World and Horizon.

[18] Singh directed his BAFTA award-winning documentary about the world's most notorious mathematical problem entitled Fermat's Last Theorem in 1996.

The film was memorable for its opening shot of a middle-aged mathematician, Andrew Wiles, holding back tears as he recalled the moment when he finally realised how to resolve the fundamental error in his proof of Fermat's Last Theorem.

The stories in the series range from the cipher that sealed the fate of Mary, Queen of Scots, to the coded Zimmermann Telegram that changed the course of the First World War.

Other programmes discuss how two great 19th-century geniuses raced to decipher Egyptian hieroglyphs and how modern encryption can guarantee privacy on the Internet.

On his activities as author he said in an interview to Imperial College London: When I finished my PhD, I knew I wasn't exceptionally good and would never get the Nobel prize.

He made headlines in 2005 when he criticised the Katie Melua song "Nine Million Bicycles" for inaccurate lyrics referring to the size of the observable universe.

[29] In July 2008, he was also awarded a degree of Doctor of Science (Honoris Causa) by Royal Holloway, University of London.

The British Chiropractic Association claims that their members can help treat children with colic, sleeping and feeding problems, frequent ear infections, asthma and prolonged crying, even though there is not a jot of evidence.

[39] A "furious backlash"[40] to the lawsuit resulted in the filing of formal complaints of false advertising against more than 500 individual chiropractors within one 24-hour period, with one national chiropractic organisation ordering its members to take down their websites,[41][42] and Nature Medicine noting that the case had gathered wide support for Singh, as well as prompting calls for the reform of English libel laws.

The purpose of the reformed law of defamation is to 'ensure that a fair balance is struck between the right to freedom of expression and the protection of reputation'.