• Born date: 1920-09-24
  • Born in: London
  • Death date: 2001-01-15
  • Death in: London
Leo Marks

Leopold Samuel Marks (24 September 1920 – 15 January 2001), MBE, was an English cryptographer during the Second World War. He headed the codes office supporting resistance agents in occupied Europe for the secretive Special Operations Executive. After the war he became a playwright and screenwriter. Near the end of his life he published a highly regarded personal history of his experiences during the war, Between Silk and Cyanide.