http://blogs.edweek.org/edweek/top_performers/2016/03/why_education_research_has_so_little_impact_on_practice_the_system_effect.html?cmp=SOC-SHR-TW
There are more reasons for why education research seems to have little impact in the United States, but I believe Marc Tucker is right when he says there's a lack of system-level thinking in our research.