Which famous 20th century author served as a brand ambassador for Ballantine Ale in the 1950s, appearing in advertisements with the tagline 'Between books, I mean'?

Throughout publishing history, famous authors have sometimes served as brand ambassadors or had notable endorsement deals that connected the literary world with commercial products. These partnerships often reflect interesting intersections between art and commerce, sometimes enhancing an author's reputation or occasionally raising eyebrows among literary purists. Test your knowledge about these unique commercial-literary collaborations!

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Ernest Hemingway
F. Scott Fitzgerald
John Steinbeck
William Faulkner