3. J.K Rowling
This woman stands apart from the others in this list as an author. She has a net worth of just over a $1 billion US Dollars. The Harry Potter series has made almost $15 billion in sales and is the most successful book series in history. She has a true rags to riches story. A few years ago she was living in poverty with little more than an idea for a book and a dream. Now she is one of the wealthiest private individuals in the world thanks to the story of a young wizard.