Introduction: the complexities of identifying mentoring best practices -- Developing mentors across contexts: the reciprocity of mentorship in school/university partnerships -- Impactful mentoring within a statewide, comprehensive induction program -- Reflection rounds in the context of virtual mentoring -- Face-to-face, online, and hybrid mentoring in a professional development program -- Empowering teachers through mentoring -- Crossing borders on the border: implementation of a mentoring network -- Building induction capacity: collaboration, formative assessment, and systems thinking -- Promising practices for developing teacher leaders in high schools: the pricipal's role -- How an assistant principal's academy evolved into dynamic group and peer mentoring experiences -- Mentoring for new principals in urban school districts: one size does not fit all -- Leaders helping leaders: mentoring after mentoring ends -- Best practices for supporting beginning principals as instructional leaders: the consultant coaching model -- Mentoring midcareer principals to build capacity for change in schools -- A summary of best practices in mentoring for teacher and leader development