Richard DuFour & Robert J. Marzano 
Leaders of Learning 
How District, School, and Classroom Leaders Improve Student Achievement

For many years, the authors have been fellow travelers on the journey to help educators improve their schools. Their first coauthored book focuses on district leadership, principal leadership, and team leadership and addresses how individual teachers can be most effective in leading students—by learning with colleagues how to implement the most promising pedagogy in their classrooms