Panagiotis Monachelis is a PhD student in the Electrical and Electronic Engineering Department at the University of West Attica (UniWA), Greece, and a teaching staff member in UniWA’s Computer Networks & Services Research (CoNSeRT) Lab. His research focuses on big data mining and visualization over online social networks. Currently, Mr. Monachelis is involved with the EUNOMIA project in the visualization field. Previously, he worked in the domain of microcontrollers at a technical company and IT in the banking sector. Mr. Monachelis earned a bachelor's degree in electronic engineering from the Technological Educational Institution of Athens and a master’s degree in networking and data communications from Kingston University, UK, in partnership with Piraeus University of Applied Science, Greece. He can be reached at pmonachelis@uniwa.gr.