Zissis Samaras is a Full Professor and former Director of the Lab of Applied Thermodynamics, Dept. of Mechanical Engineering, Aristotle University, Thessaloniki, Greece. He completed his PhD at the Aristotelian University of Thessaloniki in 1989. His research work deals primarily with engine and vehicle emissions testing and modeling and he has carried out a wide range of projects on modeling emissions from internal combustion engines. He has provided expert advice to a number of organizations and private sector customers, including the European Commission, the European Environment Agency, the World Bank, the Greek Ministry of Environment, Rhône-Poulenc, ACEA, and CONCAWE. He was vice chairman of the management committee of COST Action 319 on the Estimation of Exhaust Gas Emissions and, for many years, co-leader on behalf of the European Environment Agency of the Topic Group "Mobile Sources" of the UN-ECE Task Force on Emission Inventories. From 2009 to 2023, he was elected Academic Member and Vice Chairman of the European Road Transport Research Advisory Council (ERTRAC) on "Energy, Environment and Resources".