Dr. John Hattie is a Professor of Education and Director of the Melbourne Education Research Institute at the University of Melbourne, Australia. He is an award-winning education researcher and best-selling author with nearly 30 years of experience examining what works best in student learning and achievement. His research, better known as Visible Learning, is a culmination of nearly 30 years synthesizing more than 1,600 meta-analyses comprising more than 90,000 studies involving over 300 million students around the world.  His work has been described as profoundly important and ground breaking. In this episode, Dr. Hattie addresses multiple topics, including misinterpretations of his visible learning research, the measure of a great teacher, and what school administrators should do next.