Amr Zakaria is an Associate Professor at the Department of Mathematics, Faculty of Education, Ain Shams University, Cairo, Egypt. He received his first PhD degree in Mathematics (Topology) from Ain Shams University in November 2015 and his second PhD degree in Mathematics (Mathematical Analysis) from the Institute of Mathematics, University of Debrecen, Hungary in September 2020. He gained several scholarships and grants among them: He visited the University of Prince Edward Island, Charlottetown, Canada 3 months in 2012, and visiting student in Hungary for 5 months in 2015. Finally, he stayed in Hungary continuously between (October 2016—August 2021). During this long period as a researcher at the Institute of Mathematics, Universality of Debrecen, he gave several talks at international conferences and seminars, had much joint international research work with the members of the institute, taught several courses for graduate and postgraduate foreign students, and he is still in good contact with the Hungarian professors. He has excellent English language. Finally, Amr Zakaria served as a referee and reviewer in several international journals.