Petros Karalis graduated from Chemistry Department of National and Kapodistrian University of Athens (NKUA), in 2015. In 2018, he completed his postgraduate studies in the Department of Pharmacy of the NKUA, with his thesis being entitled “Isotopic traceability (13C and 18O) of Greek olive oils”. Currently, he is a PhD candidate on “Isotopic traceability of raw materials of ancient glass” at Geology and Geoenvironment Department of the NKUA. From 2012 until present, he has worked on 20 Research projects of the Stable Isotope Unit of Institute of Nanoscience and Nanomaterials of National Centre for Scientific Research “Demokritos” concerning natural products (wine, wine products, olive oil, honey, fresh, spring, sea water), geological materials and culture heritage materials (glass, mortar, bone, marble). His research interests focus on the development of isotopic indicators for traceability and authenticity of food (oils, wine, wine products, honey, bottled water), traceability of raw materials (sand, natron, carbonated rocks) and glass (ancient and modern), based on chemical and isotopic composition, study of Paleodiet/Palaioalimony with stable isotopes (O, H, C, S, N,), reconstruction of Palaioclimate with stable isotopes on biological (apatite and collagen of bones and teeth) and on geological (speleothems) materials.