The purpose of this mixed methods follow-up single case study was two-fold: to determine if a school district was able to sustain a professional learning community (PLC) and to identify factors that enhanced, inhibited, or promoted the sustainability of a PLC from a district-wide perspective, with particular focus on how a change in leadership, i.e. a new superintendent, affected the sustainability of PLC attributes. In addition, the role of trust in influencing the sustainability of a professional learning community will be discussed in this paper.