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Since the No Child Left Behind (NCLB) Act was implemented, professional development has been considered as one of the key strategies for maintaining highly qualified teachers and improving student achievement. Although numerous studies addressed professional development, most research examined professional development in terms of teachers’ learning and teaching practice. To date, compared to the body of studies on professional development, not many studies examined the effect of professional development on student achievement. This study examines the relationship between professional development and mathematics achievement after the NCLB Act was implemented. Based on the analysis of a restricted version of a national level dataset, National Assessment of Educational Progress (NAEP), the current study findings suggest practical and policy implications.