Apostolos Georgantzis holds the Managing Director position in ACS SA since 2003 while at the beginning of 2016 he also assumed the role the Board’s President. He holds a Bachelor (BEng) and  a Master’s (MSc) Degree in Mechanical Engineering from Imperial College of Science Technology and Medicine (UK). He has experience as an executive, specialist and entrepreneur/businessman in various positions in the Construction, Investments and Information Technology sectors.

Efi Koutsoureli, Vice Chairwoman of Quest Holdings and major shareholder, has played a key role in the development and the transformation of the company Info Quest into a Group of companies with activities in several fields of Digital Technology, in Postal and Courier Services and in the sector of Renewable Energy. Since the foundation of Info Quest in 1981, she is Directing Communication and Corporate Affairs of Quest Group, while in 2013 she was appointed as President of the CSR Committee of the Board for the introduction of CSR and Sustainability Strategies in the companies of the Group.

In the period from 2007-2010, she served as member of the board at the Federation of Hellenic Information Technology & Telecommunication Enterprises SEPE. She also serves as Board Member in various organizations and charities.

Mrs Koutsoureli is a graduate of the American University Deree College with main studies in Business Administration and Economics and post-graduate qualification in Marketing.

Theodore Fessas is the founder and major shareholder of Quest Holdings and President of SEV - Hellenic Federation of Enterprises.

Quest Holdings, established in 1981 (as Info-Quest), is listed in Athens Stock Exchange since 1998 and owns leading Greek companies in the sectors of Information Technology (Info-Quest Technologies, iSquare, iStorm, Unisystems), e-commerce (www.you.gr), Payment transactions (Cardlink), Parcel delivery (ACS courier services) and Renewable Energy operators (Quest Energy, Quest Solar).

In May 2014 he was elected as the President of SEV - Hellenic Federation of Enterprises, where he has served as Board Member for many years.

He is the Honorary President of the Federation of Hellenic Information Technology & Communications Enterprises (SEPE) and member of the Board of Directors, of International Chamber of Commerce (ICC-Hellas) as well as of the Foundation for Economic and Industrial Research (IOBE).

He holds a Mechanical & Electrical Engineering diploma from the National Technical University of Athens and a MSc in Thermodynamics from the University of Birmingham, UK.

Markos Bitsakos  holds a Business Administration degree from the University of Piraeus and a Master's degree in Business Administration from the E.E.D.E. He currently holds the position of Executive Board Member of ACS S.A.

Kostas Menegakis holds a degree in Electrical Engineering with a Master's degree in Control Systems and Computer Engineering from the Institute Polytechnic Traian Vuia in Romania and an MBA in Business Administration from the University of Louisville (Kentucky, USA). He has extensive experience in Information Technology, Telecommunications and Courier Services, having worked in various Quest Group companies. He joined ACS in 2004, assuming the role of Operations Director, and currently sits on the Board of Directors as a member since June 2015. At the beginning of 2016 he was appointed in the position of General Manager of ACS.