Professor emeritus, Amsterdam School of Communication Research (ASCoR), University of …

University of Sussex; Vrije Universiteit, Amsterdam; Tinbergen Institute; CESifo

Founder of the Institute for Scientific Information

National Program Leader, US Department of Agriculture

University of Cambridge, Yale University

Professor, KU Leuven

Professor of International Management - Middlesex University - Tilburg University

Professor of Informatics, College of Computing and Informatics, Drexel University

Professor of Economics, QUT

Professor, Dept of Informatics, Aristotle University, Thessaloniki, Greece