Leonidas Ntziachristos is Professor of Mechanical Engineering at the Aristotle University Thessaloniki, Greece and Visiting Professor at Tampere University, Finland. His research interests include clean combustion and pollutants formation, exhaust aerosol characterization, environmental sensors and emission models. He is responsible for the development of COPERT software, on behalf of the European Environment Agency and the EU Joint Research Centre. He co-chairs the transport expert panel of the UNECE Task Force on Emission Inventories and Projections and he is member of the steering committee of the European Research Group on Mobile Emission Sources. He has been consulting the European Commission on a number of regulatory initiatives including Euro-standards for emission control of cars, energy efficiency and CO2 control technologies. He serves as Associate Editor of Atmospheric Environment: X journal. His teaching duties include pollution control, greenhouse gas control and sustainability courses (ORCID-ID: 0000-0002-5630-9686, 143 papers, h:45, >5700 citations as of Jan.2022).