What was J.K. first accomplishment?

Joan Kathleen Rowling, known by her pen names J. K. Rowling and Robert Galbraith, is a British author, screenwriter, producer, and philanthropist. Her most notable accomplishment is the creation and writing of the Harry Potter fantasy series. The series has sold over 500 million copies worldwide, making it the best-selling book series in history. The books have been translated into 80 languages, and have been adapted into eight blockbuster films. Rowling has also written three companion books to the Harry Potter series, as well as the screenplay for the 2016 film Fantastic Beasts and Where to Find Them. In addition to her writing, Rowling has been involved in numerous charitable causes, including the establishment of the Lumos Foundation, which works to improve the lives of children in orphanages.