Which famous author's book endorsement program, launched in 1996, became so influential that publishers would regularly see sales increase by 500,000+ copies when their 'sticker' appeared on a book cover?

In the publishing world, author endorsements can transform an unknown book into a bestseller overnight. Throughout literary history, certain authors have developed reputations as 'kingmakers' whose recommendations significantly boost sales and visibility. This trivia question explores one of the most influential literary endorsement phenomena of the modern era, where one author's stamp of approval became known as a virtual guarantee of commercial success.

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Oprah Winfrey (Oprah's Book Club)
Stephen King (King's Recommendations)
J.K. Rowling (Rowling's Reads)
James Patterson (Patterson's Picks)