Marks, Leopold Samuel [Leo] (1920–2001), cryptographer, playwright, and screenwriter, was born at 71 Antrim Mansions, Hampstead, London, on 24 September 1920, the only child of Benjamin Marks, antiquarian bookseller, and his wife, Rachel Dorothy, née Joseph. He was a bright child—at the age of eight, he claimed, he had solved his father's and his uncle's book-pricing codes—and was noted at ...
