Conversation so far:
Who worked on the script for the film, Rosemary's Baby?
Screenwriter and Director Roman Polanski and Paramount Pictures executive Robert Evans worked on the Rosemary's Baby script.
When was the script first written for the film, Rosemary's Baby?
How was Rosemary's Baby script originally received?
What were the other projects that Screenwriter and Director Roman Polanski had to decide between with the film, Rosemary's Baby?
Roman Polanski was anxious to make a film with the sport as its basis, so received the script for Downhill Racer along with the galleys for Rosemary's Baby.
Did anyone else besides Roman Polanski evaluate the Rosemary's Baby script?
Did Screenwriter and Director Roman Polanski have any inspirations for the Rosemary's Baby script?
The Rosemary's Baby script was modeled very closely on the original novel and incorporated large sections of the novel's dialogue and details.

Question: Who wrote the novel?
Self-contained rewrite: Who wrote the novel for the film, Rosemary's Baby?