Donna Mohr is a Professor Emeritus of Statistics at the University of North Florida, where she was a colleague of William Wilson. She is an author on 20 scholarly articles on theoretical statistics and its applications. During her decades of teaching statistics, she used both the first and second editions of Freund and Wilson's Statistical Methods, before joining as a co-author in the third edition.William J. Wilson works at University of North Florida in Jacksonville, FL, USA.Rudolf J. Freund works at Texas A&M University in the USA.