This study expands on the work of Huerta "et al." (2008) by reexamining the relationship between professional development and teacher leadership using more comprehensive measures of each. By confirming Huerta "et al"'s (2008) finding that Advancement Via Individual Determination (AVID) professional development is a significant predictor of teacher leadership, the current study indicates that AVID does in fact support educators with quality professional development which helps them become more apt in their leadership abilities. Even more experienced teachers continue to develop as leaders as they receive additional professional development. Outcomes of this study are expected to benefit school leaders, teachers, AVID personnel, district level administrators and staff developers, and policy-makers interested in AVID as a school reform effort. (Contains 1 figure and 6 tables.)