谁是《哈利波特》系列小说的作者？请回答时指出作者的国籍和成名作，并在回答中使用两个英文词"Author"和"Nationality"。
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Author J.K. Rowling, whose Nationality is British, is the author of the "Harry Potter" series, with "Harry Potter and the Philosopher's Stone" being her first and one of her most renowned works.
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