Although the series credits its title character as the author, the idea was originally thought of by Elisabetta Dami.
On older novels, the copyright is issued to a pseudonym "Geronimo Stilton"; this was changed on newer books.
The books are intended for readers in the 6–12-year-old age range. Scholastic Corporation has published the English version of the series in the US since February 2004, and the books are published by Sweet Cherry Publishing in the UK.
The series has sold over 140 million copies worldwide, becoming one of the best-selling book series ever written.