Author JK (Joanne Kathleen) Rowling was a teacher when the idea for Harry came to her on a train in 1990.
She spent five years writing the first book and plotting out what will eventually be a series of seven.
She lives in Edinburgh with her family.
She's now an award-winner, including Children's Book of the Year, as well as a Smarties award winner. And she's one of the most popular authors of all time!