Little is known about how language teacher educators become, and also develop professionally as, teachers of teachers. One avenue for teacher education professional development is that of teacher research, whereby teacher educators can not only improve their practices in their immediate context but also help develop transformative pedagogies in wider contexts by sharing their research. This volume aims to understand how language teacher educators around the world continue developing professionally by examining their own teaching practices. It seeks to understand the professional gains teacher educators see in conducting research with their own students/future teachers; to promote knowledge democratisation by including teacher educators from under-represented contexts such as Latin America and Africa; to examine language teacher educators’ motivations to write for publication; and to reduce the gap between educational research and educational practice in BA and MA programmes in language teaching.