Professor of Mathematics and Chair, Michigan State University

Prof. Dr. hab., Mathematics Department, University of Warsaw

Professor of Applied Mathematics, Universidad Complutense, Madrid, Spain

Universidade de Brasília

Assistant Professor of Mathematics, University of Hartford

University of Tsukuba

Associate Professor, University of Hafr Al Batin, Saudi Arabia

Aligarh Muslim University

KFUPM

Universidade Federal do Rio de Janeiro