John Stephen Gerrard Jeffreys[1] (22 April 1950 – 17 September 2018)[2] was a British playwright and playwriting teacher. He wrote original plays, films and play adaptations and also worked as translator. Jeffreys is best known for his play The Libertine about the Earl of Rochester, which was performed at the Steppenwolf Theatre Company in Chicago with John Malkovich as Rochester, and later adapted into a film starring Malkovich and Johnny Depp.