This article presents a study which examined the transfer of pedagogical practices and conceptions of teaching and learning mathematics in the process of early professional identity development. The findings reveal that participants explained that professional development, as measured by the transfer of teacher-preparation program (TPP) practices and beliefs, was based upon innate ability and personality, pre-training experiences, preservice experiences, and in-service experiences. Furthermore, 71% of all inservice observations were coded as TPP practices, therefore, confirming the participants’ articulated perceptions about the significance of preservice preparation.