The best-selling author ever is 44 today. That’s J.K. Rowling, who has sold more than 400 million Harry Potter books.
According to The Writer’s Almanac with Garrison Keillor her first book “started with a print run of 1,000 copies. The last book in the series, Harry Potter and the Deathly Hallows (2007), had a first print run of 12 million copies in the United States, the largest first printing of any book in history.”