About the Author: Geronimo Stilton series is written under the pseudonym of the same name by the Italian author Elisabetta Dami. Using the same method, the Thea Stilton series is written under the pseudonym Thea Stilton. Dami was born on 1958 in Milan, Italy. She is a children's fiction writer. She was born in a publisher family, entering the business at her early age.