After 24 years as the chief executive officer of the Harlem Children’s Zone (HCZ), Geoffrey Canada is stepping down. An educator, social activist and charter school…

President Obama created a grant program to copy his block-by-block approach to ending poverty. The British government praised his charter schools as a model. And a new documentary opening across the country revolves around him: Geoffrey Canada, the magnetic Harlem Children’s Zone leader with strong ideas about how American education should be fixed.