The correct answer may be Samuel, but we don’t know.  So, the official answer is unknown.  What scholars do know, because they’re the ones who decided it, is that the book is in the division known as….  You actually thought I’d tell you?  Come on; what book division is Judges a part of?

-Historical Books-

-The Mosaic Law-

-The Minor Prophets-

-The Poetical Books-