Which screenplay by Kenneth Ross  was directed by Fred Zinnemann?
The Day of the Jackal (film) The Day of the Jackal is a 1973 Anglo-French political thriller film directed by Fred Zinnemann and starring Edward Fox and Michel Lonsdale. Based on the 1971 novel "The Day of the Jackal" by Frederick Forsyth, the film is about a professional assassin known only as the "Jackal" who is hired to assassinate French president Charles de Gaulle in the summer of 1963.
The 27th Day The 27th Day is a 1957 American black-and-white science fiction film from Columbia Pictures, produced by Helen Ainsworth, directed by William Asher, that stars Gene Barry, Valerie French, George Voskovec, and Arnold Moss. The screenplay by John Mantley is based on his 1956 original science fiction novel of the same name.