M.A. EL-Shehawey is an associate professor in the Department of Mathematics and Computer Science, Damietta, Faculty of Science, Mansoura University. He received his B.Sc. degree in Mathematics from Mansoura, faculty of science at Mansoura University, his M.Sc. degree in Mathematics (Partial Differential Equations), from Mansoura, faculty of science at Mansoura University, and his Ph.D. in Mathematics (Probability& Stochastic Processes) Johannes Kepler University, LINZ. His research interests include Probability& Stochastic Processes, Statistics, and Partial Differential Equations. Address: Department of Math., Faculty of Science, New Damietta 34517. email: el_shehawy@ mans.edu.eg