Which famous 20th century author served as a brand ambassador for Guinness beer, creating iconic advertising posters with the slogan 'Guinness is good for you'?

Throughout literary history, many renowned authors have served as brand ambassadors, lending their prestige and influence to promote various products and companies. These partnerships have sometimes influenced their work, public image, or provided financial support for their literary endeavors. This trivia question explores a famous literary figure whose brand ambassadorship created significant cultural impact.

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Dorothy Parker
Ernest Hemingway
John Gilroy
F. Scott Fitzgerald