Distinguished Professor of Education, The Pennsylvania State University, USA

Professor of Educational Technology. University of La Laguna, Spain, Facultad de …

Professor of Education, UMBC

Catedrático Emérito - (Emeritus Professor) UNED - Spain

Distinguished Professor Emeritus, Concordia University

Professor of Instructional Design and Technology, Virginia Tech

Anadolu University

Professor, University at Albany, School of Education, Educational Theory and Practice

Professor, School of Education, Iowa State University

Professor, Education, University of Oldenburg, Germany