The purpose of this qualitative phenomenological study was to explore high school principals' perceptions of how a supportive environment, strong family-community ties, and trust assist educational leaders in improving the culture within their schools. Participants of this study included 15 high school principals in the New York City Department of Education's public schools. Data were captured through virtual interviews, where all participants were asked the same questions and analyzed through themes and codes. The three research questions that guided this study were principals' perception of creating a positive school culture by (a) improving the supportive environment; (b) developing strong family-community ties; and (c) building trust. The four themes that emerged from this study are relationships, communication, evidence, and challenges. Analyzing the principal's responses, a positive school culture is defined as developing authentic relationships through communication to support each other for one common purpose. This study adds to the body of research by defining how high school principals can influence a student's educational experiences, which are critical turning points leading to adulthood. Future research should include quantitative and qualitative studies to identify how accurately the NYC Annual School Survey relates to principals' perceptions. Further qualitative research should focus on the connection between central employees' perceptions of their role in school support versus principals' perceptions of how the central office supports them. [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://bibliotheek.ehb.be:2222/en-US/products/dissertations/individuals.shtml.]