Thanassis is associate professor with the Web and Internet Science Group, Electronics and Computer Science, University of Southampton and is interested in decentralised data architectures, distributed linked data infrastructures, linked data for higher education, social networks and social machines.

Prior to that he was assistant professor with the Athens Information Technology Institute (AIT) in Greece working on Web technologies and e-learning. Prior to AIT, Thanassis was a research fellow with University College London (UCL) where he worked on network and service management research for telecommunication services. He was visiting associate professor at the department of Computer Science at the National University of Singapore in 2017-2019.

He holds a PhD in computer science from UCL, and a DipIng in computer engineering and informatics from the University of Patras, Greece. He is a fellow and a chartered IT professional with the BCS, a senior member of IEEE, a fellow of the Higher Education academy in the UK, a member of the ACM and a member of the Technical Chamber of Greece.