The purpose of this quantitative study, using the three-way repeated measures ANOVA, was to identify certain leadership styles used by effective and ineffective charter high school principals that impact the students' academic achievement. Principal ratings and school demographic characteristics were gathered from 19 charter schools. The study's primary question was, "Is there a relationship between charter high schools' leadership style and the Academic Performance Index (API) indicator reported by California schools to the California Department of Education?" The researcher found no relationship between the principals' leadership style and the Academic Performance Index (API) of their schools. This study makes contributions that would benefit all public school principals because it informs policymakers, school districts, and school administrator' about the principals' leadership styles that impacts students' learning. For example, the study indicated that collegial and commanding leader style showed a significant correlation with the schools' performance. This finding is suggestive that certain leadership styles may impact in the schools' performance. [The dissertation citations contained here are published with the permission of ProQuest LLC. Further reproduction is prohibited without permission. Copies of dissertations may be obtained by Telephone (800) 1-800-521-0600. Web page: http://www.proquest.com/en-US/products/dissertations/individuals.shtml.]