Which famous 20th-century author served as a brand ambassador for Guinness beer in the 1930s, writing copy and appearing in advertisements with the slogan 'Guinness is good for you'?

Throughout literary history, many renowned authors have taken on roles as brand ambassadors, lending their celebrity and credibility to various products. Some of these partnerships became legendary, while others remained lesser known. This trivia question explores the fascinating intersection of literature and advertising, revealing how even the most esteemed writers sometimes crossed into the commercial realm.

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