There are many expert teachers working in the global South and we can learn a great deal from them. Neither of these claims should be surprising, yet to date there has been almost no research conducted on expert teachers working in Southern contexts. Instead, the huge sums of money invested in attempting to improve teacher quality in the South have frequently been directed towards introducing exogenous practices or interventions that may be culturally inappropriate, practically infeasible and ultimately unsustainable - often failing as a result. In this pioneering book, Jason Anderson provides an authoritative overview of the practices, cognition and professionalism of expert teachers working in low-income contexts. By drawing upon both systematic reviews of teacher expertise and effectiveness research, and his own fieldwork in India, he argues that without an understanding of expert teachers working in all contexts worldwide, we cannot truly understand expertise itself.