Which renowned author maintained the longest continuous relationship with their original publisher, demonstrating exceptional brand loyalty in the literary world?

In the publishing world, author-publisher relationships can be as complex as the plots of the books they produce. While many authors switch publishers throughout their careers seeking better deals or wider distribution, some create lasting bonds with a single publishing house. This poll explores one of the most remarkable examples of brand loyalty in literary history, challenging you to identify which famous author maintained the longest continuous relationship with their original publisher.

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J.R.R. Tolkien with Allen & Unwin (later HarperCollins), spanning over 50 years from The Hobbit in 1937 until posthumous publications
Agatha Christie with William Collins & Sons (now HarperCollins), publishing over 66 detective novels with them
Stephen King with Doubleday, from his debut novel Carrie in 1974 through his entire career
Jane Austen with Thomas Egerton, who published all six of her major novels without interruption