Final answer:
Ira Levin, born on August 27, 1929, is the celebrated author of 'Rosemary's Baby' and 'The Stepford Wives', known for his precise and suspenseful storytelling.
Step-by-step explanation:
The author born on August 27, 1929, who wrote Rosemary's Baby and The Stepford Wives and was referred to as "the Swiss watchmaker of the suspense novel" by Stephen King, is Ira Levin.
Levin's works are known for their intricate plotting and psychological suspense, earning him high praise from peers and readers alike. His novels often explore themes of urban horror and satirize societal norms.
In Rosemary's Baby, Levin taps into the fears of parenthood and the supernatural, while in The Stepford Wives, he critiques the domestic roles of women in society.