Dr Ali Hussain Alkhaldi obtained his PhD from New South Wales University, Australia. He is currently an Associate Professor at King Khalid University, Saudi Arabia. His research interests include cryptography and differential Geometry.Dr Mohammed Kbiri Alaoui received his first PhD in Pure Mathematics from the University of Fez, Morocco, and his second PhD in Applied Mathematics from the Mohammadia School of Engineering, Morocco. He is currently an Associate Professor at King Khalid University, Saudi Arabia. His research interests are focused on partial differential equations and applied mathematics.Dr Mohamed Amine Khamsi graduated from the École Polytechnique, Paris, France, and obtained his PhD at the Pierre-et-Marie-Curie University, Paris, France. His research interests include nonlinear functional analysis, fixed point theory, logic programming, discrete mathematics, and internet mathematics education. He is considered one of the leading experts on metric fixed point theory, and is currently a Full Professor at the University of Texas at El Paso, USA.