Khalid HattafKhalid Hattaf is currently an Associate Professor at Centre Régional des Métiers de l'Education et de la Formation (CRMEF), Casablanca, Morocco. He received his Master in Numerical Analysis, Computers and Signal Processing from Mohammed I University,Oujda, Morocco. He obtained his Ph.D. in Mathematics and Computer Science from Hassan II University of Casablanca, Morocco. His research interests include mathematical modeling in virology, epidemiology, ecology and economics. He is also interested in mathematics education. He ranked among the Top 15 Moroccan researchers in Mathematics for the periods 2009-2013 and 2012-2016. Also, he has published one book, 10 book chapters and more than 100 papers in respected international journals. Recently, he has been featured among the top 2 percent of the world's most cited scientists in various disciplines, according to the American Stanford University ranking. Read More Read Less