Institutional isomorphists and other proponents of world culture theory argue that schools around the world are converging in many ways, whereas anthropologists and others question this conclusion, often arguing that local cultural differences belie superficial similarities. These viewpoints are not merely academic explanations of the spread and apparent convergence of education policies and practices around the world but are often present in policy and practice. The authors seek both to shed new light on these often-entrenched positions and to refocus the debate by considering the presence and influence of such views in the policies and practices of international teacher exchanges. In the context of the expanding global labor market for teachers, the authors consider the implicit theories underpinning international exchange policies and the ways in which the exchange teachers themselves make sense of these policies. In particular, we recognize that although extensive work has been done on the dynamics of policy borrowing, little attention has been paid to international exchange teachers as potential agents of isomorphism, adopting and disseminating practices at the local level. Paradoxically, the exchange policies construct a universal teacher who is interchangeable across national (and cultural) contexts, a view resonant with institutional isomorphists, while justifying the exchanges rhetorically on the basis of their value as a cultural exchange, a view more consistent with the culturalists. The teachers who participate, however--and who effectively self-select by their beliefs that such exchanges are possible--accept the interchangeability thesis and view such exchanges as a professional development opportunity.