Thesis advisor: Raquel Muñiz / Due to opportunity and achievement gaps in schools, leaders face the challenge of monitoring student expectations related to academic rigor and emotional health. As a result, social and emotional learning (SEL) has gained traction for students in the field of education. However, SEL competencies are rarely developed with the adults who work with these students. In this dissertation in practice, interviews, observations and questionnaires were used to collect data about the practices of school-based leaders in a qualitative case study at the elementary and middle school levels. Research revealed what leadership practices modeled SEL competencies, practices such as those involving time and resources, relationship building and sharing of expertise; and how they shaped the ways in which adults collaborate, including honest and authentic dialogue, adult learning, and the improvement of practices. This is important due to the many leadership practices employed in schools that influence adult behaviors. The findings suggest that socially and emotionally competent leadership considers both an awareness of self and other, as it cultivates individual capabilities, collaborative relationships, and a greater capacity in the schools in which it exists. / Thesis (EdD) — Boston College, 2020. / Submitted to: Boston College. Lynch School of Education. / Discipline: Educational Leadership and Higher Education.