Gregory Nooney’s book Diagnosing and Treating Dissociative Identity Disorder: A Guide for Social Workers and All Frontline Staff is a huge welcome to literature on the topic of dissociative identity disorder (DID). Nooney provides an in-depth understanding of the vast complexities of DID and strongly encourages the absolute necessity to remain educated on DID, for successful outcomes with clients. Though retired, Nooney utilizes his 35 years of experience and research in the mental health field to continue providing education to the social work and other professional fields. I have always been interested in what society historically referred to as “multiple personality disorder,” now known as DID. I have read various books and watched movies both fictional and nonfictional based on persons with DID, and I remain intrigued to the workings of the brain and how it attempts to cope with extreme trauma. As I continue to learn about DID, I have naturally asked myself whether I, along with the clinical teams I have worked with in various mental health settings, could have misdiagnosed or provided the wrong type of treatment to clients. I will be forever grateful for Nooney’s discussion of psychotropic medications being prescribed to DID clients and how a prescriptiod can be harmful to various alters within the system. Throughout the book, Nooney continues to emphasize why it is vital to stay up to date with professional development for successful client outcomes.