Leo Marks

Leo Marks was an English writer, screenwriter and cryptographer. During the Second World War, he headed the codes office supporting resistance agents in occupied Europe for the secret Special Operations Executive organization. After the war, Marks became a playwright and screenwriter, writing scripts that frequently utilized his war-time cryptographic experiences. He wrote the script for Peeping Tom, the controversial film directed by Michael Powell. In 1998, towards the end of his life, Marks published a personal history of his experiences during the war, Between Silk and Cyanide, which was critical of the leadership of SOE.