Visiting professor, Sapienza Univ Rome; ex CWTS Leiden Univ, ex Elsevier

Professor Emeritus, Tampere University

Professor, University of Mauritius

Rudy Professor Emeritus of Information Science, Indiana University Bloomington, USA

Professor of Information Science, Bar-Ilan University, Israel

Lublin University of Technology, Lublin, Poland

Spanish Research Council-CSIC. University of Valencia. Spain

Drexel University

Professor, WISE Lab, Dalian University of Technology

Professor Emeritus, University of Western Ontario