Leonidas is a research Scientist at the Institute of Oceanography of HCMR (Hellenic Center for Marine Research). He studied Physics at the University of Athens with a M.Sc. in Physical Oceanography (1990) from the same University. He was a research Associate in the Physical Oceanography group of Athens University (1990-1998). Since 1999 he has been a research scientist at the Hellenic Centre for Marine Research, member of Operational Oceanography team (POSEIDON System) being responsible for the operational data post processing and numerical forecasting as well as the development of end user applications. He participated in several EU funded projects in the field of Operational Oceanography (MyOcean I, MyOcean II, MFS, MERSEA-IP, ECOOP, etc.). PI in the ESA/GSE funded projects ROSES and MARCOAST in which he was responsible for the oil-spill forecasting service. Since 2010 he has been leading the MyOcean Mediterranean Insitu Thematic Assembly Center, where data from all the operational platforms (buoys, profilers, drifters, vessels) in the Mediterranean have being collected, processed and disseminated.