Which renowned 20th century author wrote advertising copy for Guinness beer before achieving literary fame?

Many famous authors have crossed over into the world of advertising, sometimes lending their creative talents to major brands. This unexpected intersection of literature and commerce has produced some fascinating collaborations throughout history. Test your knowledge about these literary figures who ventured into the commercial world of product endorsements and advertising campaigns.

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Dorothy Parker
James Joyce
F. Scott Fitzgerald
Ernest Hemingway