John Hattie is Laureate Professor at the Melbourne Graduate School of Education at the University of Melbourne. He is the author of Visible Learning, Visible Learning for Teachers, Visible Learning and the Science of How We Learn, Visible Learning into Action, 10 Mindframes for Visible Learning and Visible Learning Feedback, and co-editor of the International Guide to Student Achievement.

Klaus Zierer is a German educationalist and since 2015 Professor of Education at the University of Augsburg. He has lectured and written extensively on Hattie's work and translated both Visible Learning and Visible Learning for Teachers into German. Together with John Hattie he has written 10 Mindframes for Visible Learning.