Louis Frank Marks (23 March 1928[1] – 17 September 2010) was an English screenwriter and producer, mainly for BBC Television.
He began by contributing to The Adventures of Robin Hood beginning with an episode screened in 1958 and The Four Just Men (1960), both for Sapphire Films/ITC.
Marks wrote for Danger Man (US: Secret Agent, 1964), for the Doomwatch science fiction series, and for Doctor Who on four occasions.
During the Tom Baker years he wrote the Jekyll and Hyde script for Planet of Evil (1975); and finally The Masque of Mandragora (1976), which drew on his academic background and studies of Renaissance Italy.
He worked with Jack Clayton on an adaption of Muriel Spark's Memento Mori (1991), Harold Pinter on The Hothouse (1987) and with Mike Leigh on Grown-Ups (1982).