Wassell and LaVan (this issue) make strong arguments about the value of coteaching as a model for learning to teach. This response paper draws upon recent sociocultural conceptualizations of human nature and development as a process of contribution and shared contribution to extend Wassell and LaVan's findings about teacher learning and to further illuminate evidence of the transformative potential of coteaching. It is argued that the beginning teachers in Wassell and LaVan's study appropriated the cultural practices, and ontological and epistemological stances of coteaching and used these perspectives and practices to transform the cultures of their in-service classrooms as well as the roles and epistemic perspectives of their students.