Dr. Miltiadis Zamparas (PhD) serves as a Teaching and Research Associate at the School of Science and Technology, Hellenic Open University, Greece. Zamparas holds Bachelors and Masters degrees in environmental engineering from the University of Ioannina and University of Patras, Greece. He received his Ph.D. in environmental engineering in 2015 from University of Patras, School of Engineering, Department of Environmental and natural Resources Management. Zamparas has published his research in peer reviewed scientific journals and international conferences and has reviewed a number of scientific papers. His primary research activities focus on environmental analytical chemistry, environmental monitoring, materials science, characterization, as well as novel functional materials for water treatment. He has served at edited books and special issues.

Grigorios L. Kyriakopoulos is a Teaching and Research Associate at the School of Electrical and Computer Engineering, National Technical University of Athens (NTUA), Greece. holds 2 PhDs, in Low Carbon Economy (DUTH, Greece) and in Chemical Engineering (NTUA, Greece). He (co)authored more than 100 papers at 50 journals, 20 invited book chapters, and 30 papers at conferences, all received more than 2500 citations. He is the reviewer of more than 5000 manuscripts at 350 journals. His research interests are engineering, environmental systems and remediation, energy, and renewable energy sources.