Which author founded their own retail company called 'Pottermore' (later renamed 'Wizarding World Digital') to maintain control over the digital distribution of their book series?

Before authors became personal brands with merchandise empires, a few visionary writers pioneered the concept of extending their literary universe into products and experiences. This trivia question explores how one famous author transformed their fictional world into a global retail phenomenon, setting new standards for literary merchandising and brand extension in the publishing industry.

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J.K. Rowling
George R.R. Martin
Stephenie Meyer
Rick Riordan