Positive behavior interventions and supports (PBIS) was first introduced with the reauthorization of the Individuals with Disabilities Education Act in 1997. In this article, we describe the 25-year history of the PBIS implementation experience, including the core features of PBIS as a multitiered framework and the process and outcomes for implementing PBIS across over 26,000 schools. We also summarize the national outcome data of PBIS implementation and conclude with a discussion of future directions and considerations, focusing on sustainability and scaling.