This study is an exploration of the life-changing decisions and changes which the participants underwent, and which led them to pursue an education in English language teaching (or languages). The foremost objective of this study was to highlight the critical incidents from the past, present, and teaching practice of transnational students in a BA in TESOL program who are also English teachers in central Mexico. Through a narrative analysis, critical incidents in the lives of transnational student/teachers were identified. The findings of this research showed how the participants could explore their identity formation process through the critical incidents.