**About the Editors**

**Erdal Karapinar** received his Ph.D. on "Isomorphisms of -—Kothe spaces" in 2004 from ¨ Graduate School of Natural Applied Sciences, Middle East Technical University (METU), Ankara, Turkey, under the supervision of Professor V. P. ZAKHARYUTA and Professor M.YURDAKUL. He is the author and co-authors of several research papers, and he is also the co-author of the book "Fixed Point Theory in Metric Type Spaces". He is the Editor-in-Chief of "Result in Nonlinear Analysis and Advances in the Theory of Nonlinear Analysis and its Applications". He is also the associate editors of several journals. He was also a Highly Cited Researcher of Web of Science (WoS) of Clarivate Analysis from 2015–2019. He is currently a full professor at Cankaya University, Ankara, Turkey and visiting professor at China Medical University. His current research interests are focused on fixed point theory and its applications.

**Juan Mart´ınez-Moreno** is currently a Full Professor in the Department of Mathematics, University of Jaen (UJA), Spain. He is the author of more than 50 papers published in ISI journals and is involved in teaching mathematics to students of economics. His current research interests include fixed point theory, fuzzy sets, iterative procedures, involving linear operators and its techniques for image processing. He has supervised 6 doctoral theses. He has participated in the organization of more than 10 national and international conferences.

**Inci M. Erhan** was born on 9 April 1971, in Russe, Bulgaria. She received her Ph.D. in 2003 from the Middle East Technical University (METU), Ankara, Turkey. Her main areas of research are fixed point theory and its applications, numerical solutions of differential equations and dynamic equations on time scales. Currently, she is a full professor at the Department of Mathematics, Atılım University, Ankara, Turkey
