The famous British author of 'Harry Potter' is J.K. Rowling. The series, starting with 'Harry Potter and the Philosopher's Stone,' has captured the imaginations of readers worldwide since its debut in 1997. Rowling's storytelling and world-building introduced readers to a magical universe filled with various characters, spells, and adventures. The success of the series led to a multi-billion-dollar franchise, including films, merchandise, and theme parks. Rowling's impact on literature and popular culture is profound, making her one of the most prominent authors of contemporary times.