“Breaking Free: My Life with Dissociative Identity Disorder” by Herschel Walker (post 5): Does the book’s publisher think it is credible?

Neither the book’s cover nor the publisher’s Herschel Walker page https://www.simonandschuster.com/authors/Herschel-Walker/41003242 claims that anyone associated with this book is an expert on dissociative identity disorder (multiple personality disorder) or even a licensed psychologist. But I plan to read the book anyway and judge it on its own merits.

1. Herschel Walker with Gary Brozek and Charlene Maxfield. Breaking Free: My Life with Dissociative Identity Disorder. New York, Touchstone/Howard Simon & Schuster, 2009.