Themistokles Lekkas is Professor (e) of Environmental Engineering of the Environmental Science Department , Univ. of Aegean. He is a graduate of Chemical Engineering from the NTU of Athens and holds and MSc (Mark of Distinction) and a Ph.D. from the Imperial College, London. He has extensive industrial experience and has held various managerial positions. He is the founder of the Global Nest Journal. Professor Lekkas has conducted extensive research and has published research papers in the areas of water filtration, fluidization, disinfection by products, priority substances, emerging pollution and solid waste management.