Reflecting on Participatory Action Research (PAR) experiences in a Nepali community school, this paper showcases how collaborative approaches, such as cross-sectoral, teacher-student, interdisciplinary, and cross-professional actionreflections, created contextually relevant environments for improving teachers' professional development. Considering the Habermasian Emancipatory interest (1972) as theoretical referents, this paper further explains how teachers' growing professional autonomy through cross-professional collaboration enhanced their professional agency to integrate curriculum and professional development programs, to practice student-centered pedagogy, and to take on leadership positions. Finally, this paper envisions a participatory framework of and for teachers' professional development.