The presence of career change students in teacher education programs is neither new nor unusual. Despite this, there is a lack of research into the experiences of such people as student teachers. In this paper, the experiences of one career change student teacher, Michelle, and the ways in which she constructed her new professional identity as a student teacher, are examined. Using the theoretical framework of learning and identity within "communities of practice" developed by Lave and Wenger (1991) and the notion of career change student teachers as "expert novices," Michelle's experiences are examined in detail to gain a greater understanding of how, as a career changer, she "became" a student teacher. The research on which this paper is based found that as a career change student, Michelle needed to reconcile her various identities in order to construct her new professional identity in the context of teacher education. Findings were analysed and discussed with reference to Lave and Wenger's (1991) framework of legitimate peripheral participation and Wenger's (1998) communities of practice, and with recourse to the relevant literature.