The British author known for the "Harry Potter" series is J.K. Rowling. The series, which began with "Harry Potter and the Philosopher's Stone" in 1997, follows the adventures of a young wizard and his friends at Hogwarts School of Witchcraft and Wizardry. Rowling's rich storytelling and imaginative world-building captured the hearts of millions, making the books a global phenomenon. The series not only garnered immense commercial success but also ignited interest in fantasy literature, leading to adaptations in films, stage productions, and theme parks.