English learners (ELs) are the fastest growing student group in U.S. public schools. The purpose of this mixed method study was to gain an understanding of the relationship between principal actions and the academic achievement of ELs to determine which practices had the greatest impact on student achievement using archival achievement data. A mixed methods research study was conducted in an urban school district in North Texas to explore differences between principals of schools with high and non-high performance of ELs as it related to the implementation of leadership practices and social justice principles. The principals in the PK-5 grade level band who participated in an online survey, reported statistically significant differences regarding the implementation of leadership practices in the areas of leading student culture and data-driven instruction. Statistically significant differences were also found in the competency of driving for results within the social justice principles. Further data analysis of interview findings revealed the distinction between the high-performing and non-high-performing group to be centered on principal actions as inputs for effective teaching as it related to the implementation of schoolwide systems and processes. Further research is recommended to continue the identification of best practices that support the academic success of ELs in a public-school setting.