Professor(Retired) of Mathematics,Indian Institute of Technology,New Delhi

Department of Mathematics, SRM University, Kattankulathur, Chennai - 603203, India.

Department of Mathematics, University of Delhi, Delhi, India

Professor & Head, Department of Mathematics, Chaudhary Charan Singh University, Meerut

Professor and Research Fellow of Mechanical Engineering, De La Salle University

Department of Industrial Engineering, South Tehran Branch, IAU

Professor of Applied Mathematics, Islamic Azad University, Qaemshahr Branch

Distinguished Professor of Mathematical Sciences, Sharif University of Technology

Ayandegan Institute of Higher Education

Professor of Mathematics, Amirkabir University of Technology,Tehran, Iran