professor, Singidunum university, Belgrade

Professor of Mathematics and Statistics, UC Berkeley

Willmore Fellow, Durham University, UK.

Professor of Mathematics, Utrecht University

Professor of Applied Mathematics and Control Engineering, Ferdowsi University of Mashhad

Professor [Emeritus] of Mathematics, Simon Fraser University

Universidad de Castilla-La Mancha

Professor of Mathematics, University of Louisville

Professor of Mathematics, St. Olaf College

Καθηγητής Πανεπιστημίου Αθηνών, Τμήμα Μαθηματικών