Athanasios Katsis studied Mathematics at the University of Athens and holds a Master of Philosophy and a Ph.D. in Statistics from the George Washington University, USA. He is a Professor of Statistics in Educational Research in the Department of Social and Education Policy and is Rector at the University of Peloponnese. His previous posts include the Department of Statistics and Actuarial Science, the University of the Aegean in Samos, Center for Educational Research in Athens, The World Bank in Washington etc. His research interests include Bayesian Statistics, sample size determination, the economics of education and statistical modeling in educational data.