Mathematical Institute of the Serbian Academy of Sciences and Arts, Belgrade

COMSATS Institute of information Technology, Islamabad

Professor of Mathematics, SUNY at Albany

Professor of Mathematics, Universiti Kebangsaan Malaysia

University of California, Berkeley

Research scholar

Prof. Of Pure Mathematics, Mansoura University

Distinguished Professor, Zhejiang Normal University

university of connecticut

Department of Mathematics, National Institute of Technology, Tiruchirappalli