Who wrote the popular children's book series "Percy Jackson and the Olympians"?
If you chose Rick Riordan, you're correct! Rick Riordan wrote the popular series "Percy Jackson and the Olympians" based on Greek mythology. He is also known for writing the Kane Chronicles and the Heroes of Olympus series.
J.K. Rowling wrote the Harry Potter series and J.R.R. Tolkien wrote Lord of the Rings. Richard Castle is a fictional author from the TV show Castle.