Sir Charles Antony Richard Hoare (Tony Hoare or C. A. R. Hoare, born 11 January 1934) is an English computer scientist. He is probably best known for the development of Quicksort. Quicksort is the world's most widely used sorting algorithm. He also developed Hoare logic. Hoare received the Turing Award in 1980 "for his fundamental contributions to the definition and design of programming languages".