Who is J.K. Rowling? Joanne "Jo" Murray née Rowling OBE (born 31 July 1965), who writes under the pen name J. K. Rowling, is an English writer and author of the Harry Potter fantasy series. The Potter books have gained worldwide attention, won multiple awards, and sold over 325 million books. The last four books have been consecutively the fastest-selling books in history, a record which the final book currently holds. The 2007 Sunday Times Rich List estimated Rowling`s fortune at £545 million, ranking her as the 136th richest person and the thirteenth richest woman in Britain. In 2006, Forbes named Rowling the second-richest female entertainer in the world and ranked her as the forty-eighth most powerful celebrity of 2007.