Utilizing a complex theory of teacher learning and practice, this chapter analyzes ~120 empirical studies of content teacher development (both preservice and in-service) for working with multilingual learners as well as research on content teaching for multilingual students. Our analysis identified three dimensions of quality content teaching for multilingual learners that are complex and intricately connected: context, orientations, and pedagogy. This chapter explores the results of our literature analysis and argues for improving content teaching for multilingual students through improved theoretically grounded research that embraces, explores, and accounts for the expansive complexities inherent in teacher learning and practice.