As the Dual Language Learner (DLL) population increases, teachers with and without knowledge of a child’s first language and culture are faced with how best to effectively interact with and educate a rapidly growing segment of the child population. Teachers’ knowledge of first and second language acquisition, the role of culture in learning, and, very importantly, the role of language for a child’s healthy socioemotional functioning are key components influencing teacher behavior. How effective teachers are with Dual Language Learners has enormous implications not only for the educational progression of Dual Language children but also for the broader economic well-being of the community.