Ayman Mohammed Mahmoud received the B.Sc. degree in Mathematics in 2004, from Assiut University, Egypt. He is an Demonstrator of Mathematics at Department of Science and Mathematics, Faculty of Education, New valley, Assiut University, Egypt. He is currently pursuing his M.Sc. degree in Mathematics (Differential Equations). His research interests include stability, boundedness, periodicity of solutions and control system of ordinary and delay differential equations.