In this paper, the authors describe how teachers, who enrolled in an advanced master's degree program, expanded their understanding of multicultural education through teacher research. The authors address to the following question: In what ways does 'a graduate-level course with a dual emphasis on culture and inquiry through teacher research affect how in-service teachers conceptualize culture in their educational settings? The authors found that when most teachers had the opportunity to consider a broad view of culture and then apply it to their professional contexts, their understandings of teaching and learning in the classroom was enhanced.