This research examined the instructional leadership and supervisory skills of master teachers, emphasizing their influence on school improvement while considering professional attributes as a moderating factor. The study aimed to analyze the connections between leadership practices, teachers' pedagogical abilities, and student performance, employing a correlational research design through surveys administered to teachers in selected public secondary schools in Sto. Tomas, Batangas.

The results indicated that master teachers exhibited strong leadership in professional development, management, and classroom support, leading to notable enhancements in lesson planning, instructional delivery, and assessment practices. The analysis identified positive correlations among instructional leadership, supervisory skills, pedagogical competence, and student outcomes, with assessment and feedback emerging as particularly significant. Although professional attributes did not significantly moderate the relationship between leadership and student performance, they did impact pedagogical competence. The study concludes that master teachers are vital in improving instructional quality and overall school performance.