J.K. Rowling is the famous author known for her series about a boy wizard named Harry Potter. The series, which began with Harry Potter and the Philosopher's Stone, rapidly gained global popularity, leading to a successful franchise including films, merchandise, and theme parks. Rowling's blend of fantasy elements with themes of friendship, courage, and good versus evil resonated with readers of all ages, securing her place as one of the most influential authors of the 21st century.