A coherent view of student-teachers' preparation and the learning experiences to which they are exposed are key to sustaining the relevance of university-based teacher-education programmes. Arguably, such coherence is lacking and the research base to an understanding of the student-teacher experience is still a relatively limited one. This paper takes the view that student-teachers' epistemological growth is a key component of their professional development, their sense of identity as intending teachers, and their successful entry into a teaching career. In adopting a phenomenographic approach it explores a chain of evidence which demonstrates that immersion in the processes of learning and knowing, within a specific disciplinary context, had a significant impact on students' emerging professional identities and on their values as teachers which extends beyond the subject matter itself. Arguably, the findings of this case-study hold important implications for a teacher-education programme and for effective pedagogic practice.