6. JK Rowling
($1 billion)
If you don’t know who JK Rowling is you must have been trapped in some form of stasis for the last decade. One of the top-selling young adult authors of all-time, Rowling is known for the Harry Potter books, which she wrote as a way to feed her children while being a single mother. In fact, part of the first novel was written on a napkin in a coffee shop. How awesome is that? Now that napkin shop is worth $1 billion. We need to start drinking more coffee.