Dr. And Ioannis A. Katsoyiannis is an Associate Professor of Environmental Technology at the Department of Chemistry of Aristotle University of Thessaloniki. He is the President of the Association of Greek Chemists, of the Hellenic Industrial Property Academy, and a member of the administrative council of the Hellenic Industrial Property Organization. He is an expert in water and wastewater treatment technologies, water reuse, and the circular economy. He was the recipient of prestigious international fellowships, such as from the Alexander von Humboldt Foundation, the German Academic Exchange Service (DAAD), and the Swiss Science National Foundation, and he received a Marie Curie Individual Fellowship. He has conducted research at the Technical University of Berlin, the Technical University of Hamburg, the ETH (Zurich), and the EPFL (Lausanne). Between 2008 and 2014, he worked as a principal chemical engineer for the giant engineering companies Alstom Power and Hitachi Power Europe in the design, construction, and commissioning of some of the biggest thermal power plants in Europe. In 2019, he was the chair of the 17th International Conference on Chemistry and the Environment, which is the official environmental conference of the European Chemical Society (EuChemS). He is currently a member of the Executive Board of EuChemS, Chair of the Division of Chemistry and Environment of EuChemS, and editor for the journal Environmental Science and Pollution Research (Springer).