J.K. Rowling | Est. $1 billion

J.K. Rowling is the author of the beloved Harry Potter series. The books that she wrote rose to fame and were followed by the success of the film franchise it later spawned. After completing each book and each film, Rowling reportedly collected an estimated $1 billion, which made her become the one of the richest private citizens in the UK. According to sources, Rowling went through a lot while she was trying to get her books published.

Thankfully, all her hard work and dedication paid off and her writing now has a solid following. Rowling has donated much money on charity over the years, she was stived for helping poor people and solving inequality problems. No wonder that she is generous and kind. Thus, investment planning should be set in place for the billionaire author, so she does not end up with similar financial woes as before.