Dr Theodoros Triantis graduated the School of Chemical Engineering, National Technical University of Athens (NTUA), Greece and carried out his PhD (2002) at the NCSR Demokritos in the field of chemiluminescence. He then performed a post-doctoral programme at Demokritos supported by a scholarship from IKY/State Scholarships Foundation. From 2005-2017 he worked as collaborating researcher at Demokritos in the frame of several national and EU research projects. In parallel, he worked as visiting staff member at the Piraeus University of Applied Sciences (T.E.I. of Piraeus). Since 2017, he is Senior Researcher at the Institute of Nanoscience and Nanotechnology (INN) of NCSR-Demokritos, Greece. Dr Triantis has a long experience in both, Advanced Oxidation Processes (AOPs) and Environmental Analytical Chemistry. In the field of AOPs, his research activities include the following: • Photocatalysis with polyoxometalates and TiO2; •Photocatalytic degradation studies of toxic organic pollutants and cyanotoxins in water; Elucidation of reaction mechanisms and identification of intermediates and final products; • Photocatalytic activity evaluation of new nanostructured catalysts; • Radiochemical degradation of cyanotoxins and water taste and odor (T&O) compounds. In the field of Environmental Analytical Chemistry, he focused on the development and validation of modern analytical methods for the determination of emerging organic pollutants in water, food, and environmental samples using mass spectrometry (LC-MS/MS, GC-MS/MS, HRMS). His current research interests include also the isolation and characterization of bioactive compounds from cyanobacterial biomass, the identification/determination of cyanobacterial metabolites in environmental samples as well as studies related to transformation of these compounds in natural and engineered systems with focus on AOPs. T. Triantis has published 57 articles in high-quality peer-reviewed journals, 19 book chapters, 29 conference proceedings and 94 conference abstracts (Citations received: approximately 2560, h-index=28 (Source: Google scholar. Last accessed: December 16, 2021). He is also co-Editor of a book (John Wiley & Sons, Ltd) and served as Guest editor for a special issue of Toxins journal. During his long-term research experience, he has been involved in 20 European and National research projects (in two of them served as Principal Investigator). He has also participated in two European networks (PoCheMoN & CYANOCOST) and currently participates in WATERTOP COST Action as Grant Holder and Management Committee member. He serves as reviewer for various international journals in the fields of Analytical Chemistry and Environmental Sciences. Dr Triantis teaches undergraduate courses at the University of West Attica, Greece and supervises undergraduate and PhD students at the Institute of Nanoscience and Nanotechnology, NCSR “Demokritos.