Khaled M. Saad is a Professor in the Department of Mathematics at Najran University in Najran in the Kingdom of Saudi Arabia. He received his M.Sc. and Ph.D. degrees in Mathematics from Cairo University in Cairo in Egypt. He is also an Associate Professor in the Department of Mathematics at Taiz University in Taiz in Yemen. His research interests include numerical solutions for fractional differential equations. He has published more than 70 research papers in reputed international scientific journals. He is also a reviewer for more than 60 international scientific research journals.