The field of educational administration has undergone about seventy years of development and evolution. Ref. ^[1], a bibliometric review of research on educational administration from 1960 to 2018, identified four key Schools of Thought that have emerged over time: Leadership for Learning, Leadership and Cultural Change, School Effectiveness and School Improvement, and Leading Teachers. A paradigm shift from “school administration” to “school leadership” over the course of the six decades was observed. Leadership for student learning and development has become the “cognitive anchor” of the intellectual structure of the knowledge base in the field. This review focuses on this cognitive anchor. More specifically, this review synthesizes the major and most influential research on school leadership models and their indirect effects on student learning and presents the critical pathways through which school leaders successfully improve student outcomes. School leadership encompasses the core qualities and evidence-informed practices through which school leaders cultivate a strong learning culture, develop collective teacher capacity, and engage families to promote students’ academic and holistic development and achievement, while building the school resilience needed to thrive within complex educational contexts and interconnected ecological systems over time. School leaders may include principals, assistant principals, teacher leaders, leadership teams, and other actors who exercise leadership responsibilities for school-wide matters that extend beyond individual classrooms. In this paper, success is defined as a considerable improvement in student learning and other educational outcomes. Early research on effective leadership, emerging from the school effectiveness movement in North America, focused primarily on student academic achievement. More recent research on successful school leadership, drawing on effective leadership research, has adopted a broader conception of outcomes, encompassing not only academic performance but also students’ emotional, social, and psychological development. Considering that the leadership of the principal (principalship) is the most pivotal form of leadership within school leadership, this review broadly examines the research literature on school leadership; it also necessarily engages with a more specific body of principalship-focused research. Therefore, this article begins with the broader domain of school leadership research and then engages representative research on principalship. School leadership and principalship, however, are not treated as interchangeable terms in this study; rather, principalship is conceptualized as a specific and critical subset within the broader school leadership domain this review focuses on. Recent research over the past three decades has consistently shown that school leadership significantly influences student learning, second only to classroom instruction, and that this influence is mainly through indirect mechanisms rather than direct effects (e.g., [2,3]^[2][3]). The following sections first review the origins and development of research on effective school leadership for improving student achievement and broader educational outcomes. Next, the six key pathways through which successful school leaders promote student learning and counteract the negative effects of students’ socio-economic status are presented. Finally, the distinguishing features of SSL, along with the complexity of school leadership practice, are discussed. This narrative review does not attempt to be fully exhaustive; rather, it synthesizes the most cited or influential research on the topic.