Our team

Certified Trainer

Vassilis is a co-founder and COO of Ex Machina.

He is an Open Data Institute (ODI) certified trainer in open data since 2015. He holds a Production Engineering & Management Degree, an MEng in Production Systems, an MEng in Quality Control & Environmental Management, from the Technical University of Crete and a Certificate of Pedagogical Training from  the Institute of Pedagogical and Technological Education, Athens.

He is co-founder and administrator of Sarantaporo.gr, a non-profit that deploys and manages a community wireless network in 14 villages in central Greece. He is also a co-founder of FOSS Office, an open technologies experts’ network for office automation.

Vassilis is an expert in environmental and weather open data. He has worked in Greek and EU funded open data projects as an instructor and has participated in numerous conferences as an open data evangelist.


Michalis Vafopoulos (vafopoulos.org) is an affiliated researcher at the Software & Knowledge Engineering Laboratory (SKEL) of the Institute of Informatics & Telecommunications of the National Center of Scientific Research «Demokritos».

His research and speeches are focused on Web economics and business, economic networks, linked open data, Web philosophy and Web literacy.

In 2006 joined the faculty of the Department of Cultural Informatics at the University of Aegean. In 2009 served as local chair of the first Web Science conference in Athens (websci09.org) and co-founded the Master in Web science at the Mathematics Department of Aristotle University of Thessaloniki. In 2010 initiated PublicSpending.net which interconnects and analyses more than 1.5 trillion euros of global public expenditure.

In 2011 published the monography “The Web Economy: Goods, Users, Models, and Policies” which serves as a textbook in postgraduate studies. The next year introduced “Being, Space, and Time on the Web” in WWW conference and the Metaphilosophy journal. In 2014 addressed the keynote in Web Economy Festival and in 2015 has been elected as a member of the Board in the Greek Free/Open Source Software Society and director of ODI Athens.

He has writen the popular book «Living with Web» (in Greek), which presents both the social and technical aspects of the Web as an integrated part of everyday life. It will be published in English during 2016.

Today he is working on the notion and engineering of Linked Open Economy as a top-level conceptualization that interlinks the major economic open data (LinkedEconomy.org/en/).

Research Manager

Ioannis Anagnostopoulos was born in Athens, Greece in 1975. He received his diploma from the Department of Electrical Engineering and Computer Technology – University of Patras, and his PhD from the School of Electrical and Computer Engineering, National Technical University of Athens (NTUA). He serves at academia from 2004 and he is now currently Assistant Professor in the field of Web Technologies. His research interests include Internet and Web Technologies, Semantic Web and Linked Open Data, Social Media and OSNs, Intelligent Information Systems, and Communication Networks. He has more than 100 papers published in international journals and conference proceedings in the above fields.

Certified Trainer


Fotis (fotis.me) is a Freelance Web Developer based in Athens, Greece.

He holds a BSc in Informatics from Athens University of Economic and Business and an MSc in Health Informatics. Since 2007 he works as a Freelance Web Developer and Consultant and has participated in various projects. He is member of the Greek FOSS community and he is actively involved in most of the community activities.

As a Web Developer he always tries to keep up with the new trends around the Web and the latest technologies around it. Although he is a backend web developer focused on code and algorithms he also gets in touch with front-end stuff making the web more beautiful!

From 2009 to 2012 he was part of the Open Government Initiative (OpenGov.gr) of the Greek Prime Minister’s Office and had the chance to get involved on large scale Open Government projects mainly focused on Transparency and Improvement of Public Administration. His passion on Open Data emerged via his activities as a member of the OpenGov.gr where he realized the need for Open Data and the potential they have.

When not coding or in front of his laptop he pretends to be an adventurous guy by scuba diving, spearfishing or in the winter snowboarding.

Certified Trainer

Giannis Stoitsis is a partner and the Chief Operations Officer (COO) of Agro-Know. He has received a Diploma in Electrical and Computer Engineering from the Aristotle University of Thessaloniki in 2002, and a MSc. and a Ph.D. degree in Biomedical Engineering from the University of Patras and National Technical University of Athens in 2004 and 2007, respectively. Giannis is an expert in developing and delivering technologies a) for data sharing, b) for data aggregation and c) for managing, discovering and visualizing data to support research and decision making in the agricultural and food sector. He has worked in several EU-funded, National and International initiatives that are related to the design and set up of data management, data processing and data sharing solutions. He is often invited to help organizations interested in setting up platforms and services based on open data and open source technologies such as the Food and Agricultural Organization of United Nations (FAO), the International Fund for Agricultural Development (IFAD), the  Institute of Development Studies (IDS) and the Michigan State University (MSU). Giannis is also actively involved in global open data initiatives such as the Global Open Data in Agriculture and Nutrition (GODAN) and the Open Data Institute Athens Node.

Certified Trainer

Apostolos Kritikos holds an MSc in Software Engineering and specializes in Free / Open Source Software and Agile Methodologies. He has been a research associate with the Informatics Dept. at Aristotle University of Thessaloniki since 2008 and has been involved in several EU funded projects as a developer, analyst and project manager. He is the co founder of a Digital Marketing / Web Development Agency based in Greece called Social Mind in which he invests most of his time.

As a volunteer he coordinates Open Thessaloniki, an individuals’ workgroup trying to bridge the gap between Open Data / Open Government and the people of Thessaloniki, and he is the host of Open Coffee Thessaloniki, a monthly meetup for young entrepreneurs / startups that focus at new technologies and innovative products and / or services.

He believes in the power of openness and that the right use of open data can drive innovation to companies, organizations (for / non profit) and the government. He aspires, through his training, to make clear the benefits of the “right use” to the aforementioned group of beneficiaries.

Certified Trainer

Katerina studied Sociology at the University of Crete and she is currently doing her master’s degree on Public Administration at the University of Nicosia.

She has worked in European social science programs related to sustainable development and many years now she is organizing reference and user instruction at the University of Crete Library in Heraklio, designing and giving library seminars, marketing the use of electronic resources and producing guides and publicity material.  While in the Library, she participated in proposals and implementation of projects such as Zephyr  and Livesearch electronic services and the University of Crete publications’ documentation and dissemination. She is a strong supporter of open access and open data philosophy and would be excited to contribute to the deployment of open data in Universities, Libraries, Social Sciences and Public Administration in Greece.

OD Certificates

John Raptis studied at the University of Aegean the science of Statistics and Actuarial mathematics and became a member of the economic chamber of Greece but always showed great interest in Information Technology.

His studies continued at the Computer Engineering department of the Technological Educational Institute of Athens. The Fields of his particular interest include web development, data analysis, machine learning, game design and sound design.

Communications Assistant

Vivi is a member of the staff of GFOSS. She received her B.Sc in Geography at the University of the Aegean.  Her studies continue with postgraduate program in Prevention and Management of Natural Hazards at the National and Kapodestrian University of Athens. Her work entail in project management, administrative support, conference organization and dissemination activities. Vivi also is teaching open geographical information systems as a volunteer and has interest in open data, especially in geographical open data.