Giannis currently works as Director in the Library & Information Center, University of Patras, Greece. He is also the Vice President of LIBER and a member of the organisation’s Executive Board.

He has also served on the LIBER Innovative Scholarly Communication Steering Committee (strategic period 2018-2022) and on the Board of Directors of Hellenic Academic Libraries Link. From 2016 to 2019, he had been appointed Vice President of the Hellenic General Council of Libraries, a body of the Ministry of Education, Research and Religious Affairs monitoring the operation of Greek public libraries. He is also a member of the Managing Committee of the Knowledge Rights 21 programme.