Principals are expected to create a vision for their schools with clearly articulated goals for sustainable change. The 2008 Interstate School Leaders Licensure Consortium (ISLLC) Standards provide a strong framework for leadership knowledge, behavior and dispositions. ISLLC Standards 1 and 2 outline the school leader's responsibility in articulating the school vision and providing a successful instructional program. Professional Development Schools (PDSs) provide a model of school reform that enables school leaders to access multiple avenues of support in their efforts to develop implement this vision. This article considers the impact a professional development school partnership has on leadership development. The authors document the principals' perspective on the impact of the PDS partnership and how the partnership allows school leaders to focus on clear school improvement goals and targeted professional development as their leadership and school-wide sustainable changes develop over time. (Contains 5 figures and 1 table.)