New teachers who enter Australian educational systems must acquire suitable knowledge that enables them to function effectively as a teacher in this country. For immigrant professionals new to the system mere transfer of knowledge does not suffice and does not satisfy their professional perception of self. Teachers who are born and trained overseas lack culturally specific educational knowledge. These shortfalls can initiate unforseen dilemmas for their professional development and shifts in their definition of self. Acquiring new knowledge requires teachers to understand the social elements of learning and teaching in local contexts and to apply them appropriately. Mentoring relationships can be a means of bridging the gap between the newcomers' former ways of knowing and current practice, thereby mobilizing their capacity to operate effectively as a teacher in their new contexts and develop a positive professional identity. In this paper we draw on interview data from a study that involved immigrant teachers. (Contains 1 table.)