Ian Fleming
Not many people know that Fleming's production of Bond novels was severely hampered by having one hand stuck to his face. Fleming's never going to feature on any list of great writers, but he struck lucky with endorsements from luminaries such as JFK. And then two young producers suggested making a low budget movie of one of his books... The rest is very lucrative film history.
True fact. Fleming insisted that none of the plot of 'The Spy Who Loved Me' should be used on film. Probably just as well. Secret agent runs round a motel is not a great film plot.