During the 2022-2023 school year, Montgomery County Public Schools (MCPS) assigned staff development teachers (SDTs) to each school. This allocation supports three pillars of the FY 2022-2025 Strategic Plan: professional and operational excellence, academic excellence, and wellness and family engagement. The 1.0 full-time equivalent (FTE) staff was fully released from teaching duties to support teachers and the school rather than alternating between teaching and staff development. This study investigated: (1) processes and structures used to enhance staff capacity to implement district-wide and school initiatives; (2) adjustments made to instructional practices; and (3) effects on teacher capacity, student learning experiences, and academic performance. The findings demonstrated that allocating 1.0 FTE SDT per school positively impacted staff capacity, instruction, and students in key focus areas, including professional and operational excellence, academic excellence, and student and staff well-being. Successful implementation of PLPs and schoolwide PLOs drove progress in equity-centered and personalized learning, as well as new approaches to instruction. Some challenges arose in the utilization of the SDTs, highlighting the need to streamline the responsibilities refocusing on primarily on professional learning and instruction, and introducing school testing coordinators. Recommendations from the findings include systemwide guidance for consistency, subject-specific PLOs, and tailored professional learning at the school level as some ways to maximize the effectiveness of district and schoolwide efforts.