Which renowned 20th century author served as a brand ambassador for Guinness beer in the 1930s, writing advertising copy with the slogan 'Guinness is good for you'?

Throughout publishing history, notable authors have sometimes served as brand ambassadors for products, creating interesting intersections between literature and commerce. These partnerships have ranged from subtle endorsements to full marketing campaigns, often revealing fascinating aspects of the writers' personas or financial circumstances. This trivia question explores a famous literary figure's unexpected commercial connection that surprised the reading public.

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Dorothy Parker
Ernest Hemingway
Dorothy L. Sayers
F. Scott Fitzgerald