He is a Professor and a Leading Scientist with the Laboratory of Inter-Disciplinary Problems of Energy Production, Ulyanovsk State Technical University, Ulyanovsk, Russia, a Research Fellow with the Center for Applied Mathematics and Bioinformatics, Gulf University for Science and Technology, Mubarak Al-Abdullah, Kuwait, a Research Fellow with the Department of Medical Research, China Medical University Hospital, China Medical University, Taichung City, Taiwan, a Distinguished Professor with the Data Recovery Key Laboratory of Sichun Province, Neijiang Normal University, Neijiang, China, and a Visiting Professor with the Democritus University of Thrace, Xanthi, Greece. He has many collaborations with several Universities all over the world. He is the Founder and the Chairman of two international conferences. He is the author of over 650 peer-reviewed publications and he has more than 6000 citations (excluding self-citations). His research interests are on numerical analysis and specifically on: numerical solutions of differential equations, scientific computing, and optimization.,Prof. Simos was a Highly Cited Researcher in Mathematics (Lists 2001–2013, 2017, and 2018). He is the editor-in-chief of three scientific journals and an editor of more than 30 scientific journals. He is a reviewer in several other scientific journals and conferences. He is an Active Member of the European Academy of Sciences and Arts and the European Academy of Sciences, and a Corresponding Member of the European Academy of Sciences, Arts and Letters.