[Purpose]This study examines the relationship between teacher leadership (TL) and student achievement in the US and Korea. TL is defined by two primary practices: (a) supporting professional learning of peers (i.e., collaboration, coordination) and (b) influencing school decisions (i.e., distributed leadership, decision-making responsibility). [Methods]Using the 2015 PISA data, this study utilized hierarchical linear modeling (HLM) to analyze the TL practices by comparing the two countries. [Results]The present study found that the two TL practices (i.e., peer learning and decision-making) were weakly correlated to each other in both countries. HLM analysis indicated that only decision-making responsibility was statistically related to higher student achievement in the US. In Korea, collaboration was negatively related to student achievement, while coordination was positively associated with student achievement. [Conclusion]The implications for theory and policy were discussed, including the concept of TL and the complex natures of the relationships between TL and student achievement in different countries.
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