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Professional Learning Communities (PLCs) are a widely studied strategy for school improvement, with a central focus on leadership. This leadership encompasses not only school management but also teacher leadership, as teachers play a crucial role in the development of PLCs (Venables, 2018). The study aims to identify factors in the professional trajectories of teacher leaders that impact PLC leadership. A biographical-narrative case study methodology (Bolívar and Domingo, 2006) was used, focusing on the experiences of three practicing female teachers from Chile. The results indicate that key factors influencing these cases include the training received, prior leadership experiences, and environmental recognition.