Anthony Berkeley Cox was born in 1893 in Watford, England, and educated at Sherborne School and University College London. After serving in the Army in World War I, he worked as a journalist for many years, contributing to such magazines as Punch and The Humorist. His first novel, The Layton Court Murders, was published anonymously in 1925. It introduced Roger Sheringham, the amateur detective who features in many of the author's novels including the classic Poisoned Chocolates Case. In 1930, Berkeley founded the legendary Detection Club in London along with Agatha Christie, Freeman Wills Crofts and other established mystery writers. In 1938 he took up book reviewing for John O'London's Weekly and the Daily Telegraph, writing under his pen name Francis Iles. He also wrote for the Sunday Times in the 1940s and for the Manchester Guardian, later The Guardian, from the mid-1950s until 1970. A key figure in the development of crime fiction, he died in 1971.