Catholic schools are founded upon distinctive values; they shape school leaders' leadership approaches, which in turn influence the school community experienced by students. Yet, research is sparse where leaders' intentions intersect with the actual community. The purpose of this qualitative case study was to examine how school leaders' approaches to community affected alumnae voices, based on their described lived experiences as students, in two all-girls Catholic high schools in the western United States. Answers to three research questions were sought. First, how does a Catholic-values foundation affect a school leader's leadership approaches? Second, how does a school leader intend to affect school community through their approach? Third, how do the alumnae perceptions of the communities they experienced as students differ between schools, particularly regarding relationship and wellbeing? This exploratory research used a qualitative case study approach with semi-structured interviews. It involved a cohort of eight alumnae that had attended and could speak of both schools firsthand. Also included was each school's leader detailing her influences and intentions; their leadership approaches were compared to a researcher-constructed idealized theoretical framework that linked Catholic values to various leadership styles and theories. Interviews with supporting notes were open coded structurally and inductively. Resulting in vivo quotes were categorized using second cycle axial coding to generate common themes. The findings characterized the school leaders and communities. Each leader expressed their Catholic foundation differently: one with active missionary zeal and the other with more natural ease of incorporation. Both focused on service, one through expressive personal relationships and the other in formalized professional roles. Alumnae preferred an internalized welcoming culture, sought broad peer relationships, and valued mental health. The findings' long-lasting impacts remain to be seen. The theoretical framework was supported and indicated a better leadership approach involves a zealous and outward expression of Catholic principles, focused on persons qua persons. This could be accomplished through being a visible presence, creating authentically welcoming culture, and ensuring alignment with Catholic identity through rationality and communication. While further studies could help establish these findings' generalizability, they may already help Catholic school leaders create thriving communities. [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.]