Alan Turing was a British mathematician and code-breaker. He was convicted of homosexuality in 1952 and sentenced to 12 months in prison.

He died of cyanide poisoning in 1954. He is credited with developing the "Turing machine" and the "Ferranti Mark I" computer. His name will appear on a new British banknote on the 100th anniversary of his birth in 1913. He also worked on the development of the first computer, the Fermi machine, which was used in World War II.