Which advertising campaign is credited with transforming an initially slow-selling novel into a bestseller by using the innovative 'teaser' approach with billboards asking 'Who is John Galt?' across America?

In the world of literature and publishing, marketing innovations have sometimes made all the difference in a book's success. Beyond great writing, clever advertising campaigns have transformed unknown manuscripts into cultural phenomena. This trivia question explores one of the most influential book marketing campaigns that revolutionized how literature reaches audiences and created a template still followed by publishers today.

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Ayn Rand's 'Atlas Shrugged' campaign by Random House (1957)
F. Scott Fitzgerald's 'The Great Gatsby' campaign by Scribner's (1925)
J.D. Salinger's 'The Catcher in the Rye' campaign by Little, Brown and Company (1951)
Harper Lee's 'To Kill a Mockingbird' campaign by J.B. Lippincott & Co. (1960)