Abstract
In this qualitative case study, we trace the journey of one preservice secondary mathematics teacher through each of their placement experiences during their initial teacher education degree. The purpose of tracing this journey was to examine the way in which teacher identity develops throughout an entire preservice education degree. The findings of this case study reveal how formative and transformative school-based placement experiences are and begin to shed light on the key placement experiences that shape a positive mathematics teacher identity. Practical implications in relation to quality supervision of mathematics preservice teachers are also revealed in the data.