Philip S. Hall earned his Ph.D. from the University of Montana in 1972. During his forty-year professional career, he assisted teachers in Montana, Minnesota, the Dakotas, and Wyoming to help children with debilitating learning and behavior problems find success in the classroom. As an academic, he helped graduate students become competent school psychologists. In the process, he wrote or co-authored ten books, including three on the history of southwestern South Dakota and the widely used book Educating Children with Oppositional Defiant Disorder. He was a featured presenter at numerous conferences across the United States and Canada. His latest book is From Wounded Knee to the Gallows: The Life and Trials of Lakota Chief Two Strikes (University of Oklahoma Press, 2020). The White River Badlands: Its History and Characters is his final book.