Book excerpt: The author examines who language teacher educators are in the field of language teaching and learning. This includes a description of the different types of language teacher educators working in a range of professional and institutional contexts, an analysis of the reflections of a group of experienced English teacher educators working in Colombia and enrolled in a doctoral program to continue their professional development, and an exposition of the work that language teacher educators do, particularly in the domains of pedagogy, research, and service and leadership (institutional and community). All of this is done with the aim of understanding the identities that language teacher educators negotiate and are ascribed in their working contexts. The author emphasizes the need for research to pay attention to the lives and work of language teacher educators, and offers forty research questions as an indication of possible future research directions.