JK Rowling is a British author and one of the wealthiest private citizens in the United Kingdom, with a net worth of $1 billion. Rowling was born in Yate, Gloucestershire, England, and studied French and Classics at the University of Exeter before becoming a researcher and then an English teacher in Portugal. Rowling conceived the idea for her first novel in during a delayed train ride in 1990 and finished it in 1995: Harry Potter and the Philosopher's Stone, the first in an eventual series of seven and the beginning of a major literary, film, and licensing industry. As the books gained popularity around the world, they broke literary sales records—the last two, Harry Potter and the Half-Blood Prince and Harry Potter and the Deathly Hallows, sold nine and eleven million copies, respectively, within twenty-four hours of their releases. With the success of the novels came a series of popular films—kicked off when Warner Bros. paid seven figures for the rights to the first two books—six of which have been released. Rowling married anesthetist David Murray in 2001, and the couple have two children, along with Rowling's daughter from a previous relationship. They live in Edinburgh, London, and Aberfeldy, Scotland.