Dr. Hassan El Bari has been a Professor at Ibn Tofail University in Morocco since 1988. He obtained his PhD in Materials Science from INPL (France) in 1987 and also has a "Doctorat d’Etat" in Mechanical Engineering from the University Mohamed V in Morocco, received in 1998. He is the president of the Moroccan Association of Solid Waste. He was Master Degree Coordinator: Waste Management and Recovery (2010–2014) and Member of the International Solid Waste Association (2004-2014). He has been involved in many funded projects as a coordinator and partner, and has significant experience in teaching solid waste management, biomass and bioenergy, and anaerobic digestion technology. Prof. El Bari is an associate editor of the Cleaner Waste Systems Journal (Elsevier) and guest lecturer at the University of KwaZulu-Natal, South Africa. He has authored or co-authored several book chapters and edited or co-edited 3 books.