Prof. Saulius Kaciulis received his M.Sc. degree in physics and Ph.D. degree in semiconductor physics from the University of Vilnius, Lithuania, in 1977 and 1983, respectively. From 1976 to 1997, he was employed at the Semiconductor Physics Institute in Vilnius. Since 1985, he has started to specialize in the techniques of solid-state surface analysis XPS, AES, SIMS, etc. From 1992 to 1996, he was a Visiting Professor at the Institute of Materials Chemistry, National Research Council (CNR), Italy. From 1997 to 2020, he was a Senior Researcher at the Institute for the Study of Nanostructured Materials, CNR, Rome, Italy. Since 2020, he has been a Director of Research at the Institute for the Study of Nanostructured Materials, ISMN, National Research Council. His research interests are surface analysis and depth profiling of innovative solid-state materials, including thin films and heterostructures, anti-wear and corrosion-resistant coatings, biocompatible materials, nano-structured and 2D materials. He is a co-author of over 250 scientific papers and two books.