This study aimed to shed light on the process of professionalization of teachers marked by the performance in private schools that cater to the popular sectors of society from the life stories of their teachers. For this, we interviewed eleven teachers working in these schools, located in the southern city of Rio de Janeiro. Looking at the trajectories followed by these teachers, looking for convergence in particular, it was possible to see how the professional identity of each is built on the walk, which joined the trail from his many personal and professional experiences. In this sense, the work focuses initially on the lives of these teachers, revealing the fact that this group made the choice of teaching as possible, through a process of attachment to the profession during their education or already in their professional development, giving new meaning the idea of vocation. Then discusses the pedagogical practice of faculty in this context, with the emphasis on content delivery, maintenance of routine activities and in the solitary work of each professional. It also presents the strength of personal relationships established between faculty and management and examines issues related to working conditions at the school. Thus, it seeks to understand the possession, by these teachers, of a specific pedagogical capital and the creation of a professional habitus constantly adapting. Finally, it analyzes the professionalization of teachers in this school, bringing up points that approximate and others that separate this faculty of imagination on the teaching in private schools.