Maastricht University - SHE, Open University of the Netherlands, University of Bergen

Dept. of Educational Studies, Ohio University

Professor of Educational Psychology, Erasmus University Rotterdam / University of …

Distinguished University Professor (Educational Psychology), Open University of the …

University of Southern California

University of Freiburg (Germany)

University of California, Irvine

professor emeritus at Utah State University

Professor of Educational Psychology, University of New South Wales, Sydney, Australia

Professor of Special Education, Wheelock College