His research focuses on educational policy, and other policy areas that have experienced transition to innovations. Specifically, he is studying charter schools. Charter schools have been regarded as an innovation in the educational area because they keep the main characteristics of public schools - equity and democracy, while maintaining autonomy over the contents of their charters. Their influence is more impressive than other innovations such as open enrollment law and magnet schools in the public education area. To study this phenomenon, many scholars have specifically been navigating charter school adoption at the state level, asking why states adopt or do not adopt charter school law. The state-level studies on this topic are still applicable in today's climate, in which 40 of 50 states have adopted laws authorizing the charter schools. However, charter schools have actually been operated at the local level although local policies are affected by state laws and nested in state laws. His study is expected to contribute to this area by examining school districts in which charter schools are operated. This study is supported by three theoretical approaches: diffusion, policy entrepreneurs & social capitals.