Fotis N. Koumboulis (Director of RCCL) and Maria P. Tzamtzi (member of RCCL) participate in the Technical Program Committee of the 18th International Conference on Metadata and Semantics Research (MTSR 2024), that will be held in Athens, on 20 - 22 November 2024 (http://www.mtsr-conf.org/home ). MTSR is an annual international inter-disciplinary conference, which brings together academics, researchers and practitioners in the specialized fields of metadata, ontologies and semantics research. The conference provides an opportunity for participants to share knowledge and novel approaches in the implementation of semantic technologies across diverse types of information environments and applications. These include Open Access Repositories and Digital Libraries, Cultural Informatics, Digital Humanities, E-learning applications, Search Engine Optimization and Information Retrieval, Research Information Systems and Infrastructures, e-Science and e-Social Science applications, Agriculture, Food and Environment, Bio-Health & Medical Information System.