Stell Selby holds a Bachelor of Arts in sociology and a Master of Education in Education and Public-School Administration. Selby spent over three decades in education, culminating in principal roles at Rehoboth Elementary and assistant principal/teacher positions at Cape Henlopen High School. Selby's career transition included a significant appointment to the Board of Trustees at Delaware State University, showcasing a commitment to higher education governance and reform.

Stell Selby’s political identity is marked by a blend of progressive advocacy and strategic pragmatism, particularly in education and governance. Selby’s ideological shift from Republican to Democrat before Trump’s election highlights a principled realignment. Her legislative focus on education reform and public-school administration underscores a commitment to systemic improvement, while her appointment to the Delaware State University Board of Trustees reveals an interest in higher education governance. Selby’s approach suggests a calculated balancing of regional interests with broader educational goals.