Obtained Phd thesis, in 2005, at the University of Marseille-France. After he moved for two Postdoctoral positions. The first one was in (WIAS) Weierstrass Institute for Applied Analysis and Stochastics in Berlin-Germany. The second Postdoctoral position was in (NCMM) Necas Center for Mathematical Modeling in Prague-Czech Republic. Now, he is a Full Professor (since January 2015) of Mathematics at the Department of Mathematics in the University of Annaba-Algeria. He has begun teaching as lecturer at Annaba University since 1994/1995 during his first year of Majister Thesis. Defended the French Habilitation (Authorization to Conduct Research: see https://www.univ-amu.fr/en/public/authorization-conduct-research-hdr) in May 19th 2016 at the Aix-Marseille University in France. He got the "Qualification aux Fonctions de Professeur des Universités " in France in March 2021. His main research interest is the Numerical Methods for Partial and Fractional Partial Differential Equations. One of the main recent research interest is the Numerical Methods of Inverse Problems. Had also some interest with Modeling and Simulation using the COMSOL Multiphysics. He was invited by the following institutes/Centers for either short staying or to give talks/Courses: 1/ EUR (Ecole Universitaire de Recherche) in the University Sorbonne of Paris Nord-France: https://eur.univ-paris13.fr/en/overview/ in the period September 12--October 11, 2024. The framework of this visit is a Visiting Professor Position. He had the opportunity to give two M1/M2 courses. 2/ LAGA (Laboratoire d'Analyse, Géométrie, et Applications)-Paris 13 in the period October 16th--November 15th, 2021. Invited by Prof. F. Benkhaldoun. 3/ LAGA (Laboratoire d'Analyse, Géométrie, et Applications)-Paris 13 in the period June 2nd--June 16th, 2019. 4/ LAGA -Paris 13 in the period March 23rd--April 8th, 2018. 5/ LAGA in the period November 12th--26th, 2017. 6/ WIAS (Weierstrass Institute of Applied Analysis and Stochastics)-Berlin-Germany in the period June 9th--June 16, 2016. Invited by Prof. J. Fuhrmann. 7/ WIAS in the period August 31--September 9, 2013. 8/ Nečas Center of Mathematical Modeling, Prague-Czech Republic, to spend one month in the year 2007/2008. Not gone because of some personal conditions. Invited by Prof. J. Malek. 9/ WIAS in the period March 15--31, 2006. Invited by Prof. J. Fuhrmann. 10/ Departamento de Mathematica, Instituto Superior Tecnico, Lisboa, Portugal, July 13--15, 2006. Invited by Prof. A. Sequeira. 11/ WIAS in the period Februrary 14--17, 2006. He got also the Position of Professor Invité, for one month, in the University Paris 13. He has begun teaching during his first year of research (DEA-Diplôme d'Etudes Approfondies) in 1993/1994 in the University of Annaba-Algeria. He had also the opportunity to teach as ATER (Attaché Temporaire d'Enseignement et de Recherche) in the Aix-Marseille University-France, 2005/2006. His teaching has covered several courses starting from Undergraduation (Probability, Statistics, Algebra, Analysis) to Postgraduation courses which include Numerical Analysis and Applications of Mathematics. As reviewer, he had opportunity to review for some very prestigious journals, e.g. Comptes Rendus of the French Academy-Mathematics (CRAS) and ESAIM: Mathematical Modelling and Numerical Analysis (ESAIM: M2AN). He had also the opportunity to review some Projects for Funding in International Universities.