Which famous author established their own publishing company called 'Bloomsbury Publishing' before writing their bestselling book series?

While we know authors for their literary masterpieces, many famous writers have ventured into product development and brand extensions. Some have created merchandise empires, others have licensed their characters for commercial use, and a few have even established retail businesses. Test your knowledge of these literary brand crossovers that have shaped both commerce and culture.

This is a live public trivia poll on AIPolls.Net. Vote and see real-time results.

J.K. Rowling (Harry Potter series)
Virginia Woolf (with the Hogarth Press)
George R.R. Martin (Game of Thrones series)
Stephen King (with Philtrum Press)