This research was designed and conducted to study the role and function of the secondary school department chairperson in a collegial peer coaching environment. Specifically, the study focused on the relationships between instructional staff and chairperson, chairpersons instructional leadership, the teaching practices of chairperson, and valuing, focusing, and modeling of collegial peer coaching by chairpersons. A case study research design was used that relied both on quantitative and qualitative methods and data. The study is a combination of a descriptive and an evaluative case study.