Professor John Allan Clinton Hattie has been Professor of Education and Director of the Melbourne Education Research Institute at the University of Melbourne, Australia, since March 2011. He was previously Professor of Education at the University of Auckland.

John Hattie developed a way of ranking various influences in different meta-analyses according to their effect sizes. In his ground-breaking study “Visible Learning” he ranked those influences which are related to learning outcomes from very positive effects to very negative effects on student achievement.