Dr. R. Neffati, Ph.D (6/1999) in physics from the University of Paris XI after a Ms. Sc in condensed matter Physics at “ENS” of Cachan, France. He lectured at University of Marne la vallée (Paris-est) during 1999-2000, then worked for three years as Post doc within the Dutch Polymer Institute at the Technical University of Eindhoven – the Netherlands. Stating from 2004 he has a permanent position at the University of Carthage in Tunisia as assistant professor and moved since 2015 to the King Khalid University in Saudi Arabia. Since 2020 he is a permanent member of the laboratory of condensed matter Physics (FST-University of El Manar). He is interested in various topics in condensed matter, complex system and statistical physics.