Linked data visualization, 2020: title page (George Papastefanatos) page 142 (Dr. George Papastefanatos has been a researcher in Information, Communication, and Knowledge Technologies for the Research and Innovation Center "Athena" at the Information Management Systems Institute (IMSI), since 2009; obtained his Diploma on Electrical and Computer Engineering and his Ph. D. in Computer Science from the Department of Electrical and Computer Engineering of the National Technical University of Athens (NTUA) in 2000 and 2009, respectively)