However, "Carolyn Keene" was actually a pseudonym used by a series of different authors, including:
* Mildred Wirt Benson (the original author for most of the early books)
* Walter Karig
* Harriet Adams
* William Campbell Gault
* Andrew Svenson
The series was originally published by Grosset & Dunlap, and the "Carolyn Keene" identity was used to maintain a consistent voice and image for the series.