Which famous author's estate pioneered the concept of 'posthumous brand management' by establishing a dedicated company that still strictly controls all adaptations, merchandise, and publishing rights?

The publishing industry has evolved dramatically over centuries, with famous authors becoming powerful personal brands. Publishers have developed sophisticated marketing strategies to position literary works, sometimes creating publishing empires around a single author. This poll tests your knowledge of the brand strategy behind some of literature's most successful names and how their literary estates continue to generate billions in revenue long after their deaths.

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J.R.R. Tolkien (The Tolkien Estate Ltd.)
J.K. Rowling (The Blair Partnership)
Dr. Seuss (Dr. Seuss Enterprises)
Agatha Christie (Agatha Christie Limited)