Board of Directors

He was born in Athens in 1954. He holds a degree in Electrical Engineering from the National Technical University of Athens.
Until 2002, he was Chairman and Managing Director of “J.D. Papathanassiou S.A.”, a company engaged in the trading of technological equipment for buildings.
His political career started in 2000 when he was first elected as a Member of the Greek Parliament, with the New Democracy party. He was re-elected in 2004, 2007, 2009 and in May 2012. He served in several posts:

• From March 2004 to September 2007, he was Deputy Minister of Development for Commerce and Consumers’ issues, while in 2005 he was also assigned the Research and Technology issues of the Ministry.
• From September 2007 to January 2009 he was Deputy Minister of Finance and Economy for Investments and Development.
• From January to October 2009 he was Minister of Finance and Economy.

He was Secretary-General of the Athens Chamber of Commerce and Industry (ACCI) for six years (1987-1993) and President of the ACCI for seven years (1993-2000).
In 1993, he was appointed Vice Chairman of the BoD of Public Gas Corporation (DEPA) S.A., while in 1991-1992 he was advisor to the Minister of Industry on energy issues.
He chaired the BoD of HELLENIC PETROLEUM S.A also during the period 27/2/2014 – 4/5/2015.
He speaks English, French, and German.

Holds an Economics degree specialising in Econometrics from the University of Essex England and is a Fellow (FCA) member of the Institute of Chartered Accountants in England and Wales (ICAEW).

He began his career in 1989 with KPMG in London, specializing in banking and large multinational Groups before joining the international food and drink group DIAGEO in 1993, to assume senior Greek and European positions in Finance and Business development. During 1998-1999 he also worked for the development of the food sector business (Pillsbury) in Middle East and North Africa. Between 2000-2002 he worked as Chief Financial Officer and Chief Restructuring Officer in an ASE listed high-tech company (part of LEVENTIS Group) and in 2003 he joined PETROLA HELLAS as Chief Financial and IT Officer.

After the legal merger and operational integration of PETROLA HELLAS  with HELLENIC PETROLEUM, he was appointed as CFO of the new Group in 2005 and became a member of the Group’s Executive Committee.  In 2012 he assumed the responsibility for International subsidiaries and he was Deputy CEO during the period 2014-2015 and 2017- 2019 when he became CEO.

Mr. Α. Shiamishis serves as a board member of the Hellenic Federation of Enterprises (SEV)  and is Chairman of the BoD of  SEV Council for Sustainable Development (BCSD). He is a founding member of the American Hellenic Chamber of Commerce  (AMCHAM) board of Corporate Governance and is also a member in a number of professional bodies including the Economic Chamber of Greece and ICAEW specialized faculties.

As General Manager of Strategic Planning and New Business for the Group, he is responsible for the strategic planning and management of new business development in natural gas, electricity, renewable energy sources, exploration and production, strategic projects, and participations (DEPA/Elpedison/ASPROFOS) and the Group’s representation in international organizations. He has been a member of the Board of Directors of the European Petroleum Refiners Association as a regular or alternate member since 2012. He joined HELLENIC PETROLEUM Group in 2007.

He held the position of Director of Strategic Planning and Development in an international group of companies (SETE S.A.), based in Geneva, Switzerland, from 1998 to 2006, where he was responsible for overseeing the group’s energy portfolio.

Previously, he worked for a number of technical and executive positions at Stone & Webster, Molten Metal Technology, Merck, Dow Corning, and Dow Chemical in the United States between 1993 and 1997.

He holds an MBA degree (1998) from Harvard Business School and M.Sc. (1993) and B.Sc. (1992) degrees in Chemical Engineering from the Massachusetts Institute of Technology (MIT).

He graduated from the University of Athens with a Degree in Economics (Department of Politics and Economics). He completed his postgraduate studies at the University of Lancaster (England) and he obtained a Postgraduate Diploma in Economics and a Masters of Arts (M.A.) in Marketing and Finance.

He worked at senior positions with Greek and international banks in Athens, Greece, and he was Chief Financial Officer (CFO) and Chief Operating Officer (COO) with Hellenic Telecoms (OTE S.A.). Following the acquisition of OTE by Deutsche Telekom (DT), he joined OTE’s Board of Directors as an Executive member and DT’s European Management Board. Additionally, he was sitting, as a NED, on the Boards of Greek listed companies.

Currently, he is Chair of the Special Liquidations Committee of the Bank of Greece. 

Mr. Theodoros-Achilleas Vardas is a Member of the Board of Directors of HELLENIC PETROLEUM since 2003. He also serves as Vice Chairman of the BoD of EKO SA, the Group’s marketing company.

He was born in Athens in 1950. He has a Degree in Chemical Engineering from the Swiss Federal Institute of Technology in Zurich and a Ph.D. from the Systems Engineering Department of the same institute.

He began his professional career in 1979 at the Latsis Group, where he worked in key positions and in 1981 as General Manager of Petroleum Products Trading. At the same time, from 1988 to 2003, he was the Deputy CEO and Member of the BoD of Petrola Hellas SA.

Since October 2003, following the merger of Petrola Hellas SA and HELLENIC PETROLEUM SA until the end of 2016, he served as a Management Consultant of HELLENIC PETROLEUM SA.

He also served as a Member of the BoDs of Papastratos SA (1999-2003), DEPA SA (2004-2016), and ELPEDISON BV (2008-2016).

He is married and the father of two children.

Mr. Vrettos was born in Athens in 1962. He obtained his diploma as a Chemical Engineer from the University of Karlsruhe (Germany) and a Ph.D. in Computational Solid State Physics from Kyoto University (Japan).

From 1990 to 1991, he worked for the Bayer Group Japan, and then until 2014 at The Boston Consulting Group in Düsseldorf, New York, Athens, and Tokyo as a Senior Partner and Managing Director, specializing in a number of fields including energy, the financial sector, shipping, industrial goods, health care, telecommunications, retail, and airlines.

From 2013 until today he is a member of the Board of Directors and a seed investor in the German technology company nanoSaar AG, and since 2015 advisor and consultant to family offices.

He has been a member of the General Council of the Federation of Greek Industries, the Executive Committee of the Hellenic-American Chamber of Commerce, and the Board of Directors of the Federation of Young Entrepreneurs. He has also authored publications on economic studies, as well as articles on financial issues.

As an ex banking sector director, Natasa Martsekis has significant experience in the international equity and capital markets.

She was Head of Institutional Equity Sales in Alpha Finance/ Alpha Bank for 19 years where she led and managed the largest institutional international fund managers investing in Greece. Before that, she had similar managerial positions in Lehman Brother (New York & London), Citibank (Zurich), and Shell Oil.    

Currently, she is an independent -non executive member of the Board of Directors of FOURLIS TRADE ESTATES ΑΕΕΑΠ, a newly established real estate investment company, and of  ATHENS WATER SUPPLY AND SEWERAGE COMPANY (E.YD.A.P.). 

In 2014, she founded Bright Blue, a company engaged in the tourist sector.

Natasa is a founding member and Secretary General of NED Club Greece, an independent entity aiming to promote the role of best corporate governance practices in Greek companies through the independent non-executive members of the Boards. She is also a member of the ESG Working Group of European ecoDA and has participated in educational programs of BoD members on issues of ESG and Corporate Governance.

She holds an MBA Degree from Columbia Business School, where she was a Fulbright Scholar and a Bachelor in Business Administration & Finance from the Athens University of Economics and Business (ASOEE). She graduated from Anavryta Lyceum.

She is a member of Woman on Boards UK Columbia Business School Women’s Circle Club and an active volunteer in Safe Water Sports.

Born in Athens in 1967. He studied law at the Law School of the National and Kapodistrian University of Athens, from which he graduated in 1990. During the years 1992-1993, he followed post-graduate studies and obtained a master's degree from the University of Southampton in UK in the field of Corporate Law, European Community Law, and Information Technology Law. His dissertation was on banking law and in particular on the collapse of BCCI bank, incorporated under the laws of England, and the relevant international regulatory legal framework.

From 1993 he is  attorney at law, member of the Athens Bar Association, and he is specialized in corporate law, banking law, and mergers & acquisitions, as well as in dispute resolution, before the competent courts, related to the above fields.

From 2004 until today he is partner of the Law Firm “Sarantitis Law Firm” and from 2018 deputy managing partner of the said law firm., whilst from 1994 until 2004 he was associate of the law office “Sarantitis & Partners”.

Ms. Scaramanga was born in Scotland and is a graduate of the University of Glasgow, with an MA (Language and Literature) and LLB (Law). She is a fellow (F.C.A.) of the Institute of Chartered Accountants in England and Wales (ICAEW), as well as a member (non-practicing) of the Institute of Certified Public Accountants of Greece (SOEL).

She has extensive experience in accounting, finance and auditing. She worked at Arthur Andersen in London between 1979 and 1985 and at Coopers & Lybrand/PwC in Greece from 1985 to 2005, where she became a partner in 1991. Subsequently, between 2005 and 2011, she was a Consultant/Finance Director of Alpha Tankers & Freighters International Ltd and, from 2007 to 2020 she chaired the Audit Committees of Eurobank Bulgaria (Postbank) and Eurobank Serbia (Beograd). She also acted as a consultant on quality assurance and improvement matters for the Internal Audit Department of a large Greek Bank and provided consultancy services in the shipping sector.

She is currently a member of the Board of Directors and of the Audit Committee of Eurobank Private Bank Luxembourg and an independent non-executive member of the Board of Directors of “Athens International Airport S.A.” and chairs its Audit Committee.

Mr. Tridimas was born in Athens in 1963. He is a graduate of the University of Athens, with a degree in Legal Sciences, and holds a Master of Science (LL.M.) and a Ph.D. from the University of Cambridge with a specialization in Harmonisation of Securities Regulation in the European Community.

He is a lawyer in Athens since 1987 and a Barrister in England and Wales since 2000 and has appeared before the European Court of Justice, the General Court of the European Union, the Supreme Court of the United Kingdom, the European Court of Human Rights, as well as investment arbitration courts.

He previously held academic positions at the Universities of Birmingham, Southampton, Cambridge, and London (Queen Mary), while he has also worked at the European Court of Justice as a Référendaire. He has taught in a number of universities in Europe, the U.S.A, and Canada.

He is currently Professor of European Law and Director of the Center for European Law at Dickson Poon School of Law, at King’s College London, while he is also Professor and Distinguished Researcher (Nancy A. Patterson Distinguished Faculty Scholar) at Pennsylvania State University School of Law (Penn State Law) and Visiting Professor at the College of Europe in Bruges. He works as a Barrister at Matrix Chambers in London.

He has experience in international and European affairs, having been an advisor to European institutions on a number of legal issues as well as the Republic of Cyprus during the negotiations on Brexit, as well as the Greek Presidency of the European Union between 2002-2003 with emphasis on issues of enlargement of the European Union.

From 2005-2013 he was an independent non-executive member of the Board of Directors of EFG Eurobank, and since February 2020, he is a non-executive member of the General Council of the Financial Stability Fund.

He has published numerous legal studies and has written important textbooks on European Law.

Born in Athens in 1964. Attorney at law graduated from the University of Athens, Law School (LL.B.) and the University of Kent at Canterbury, UK (LL.M on European Competition Law, Intellectual Property, International Business Transactions, and Ph.D.).

His fields of expertise include commercial law, competition law, electronic communications, and media,  intellectual and industrial property law, information technology law with an emphasis on electronic payments, mergers, corporate law, and on corporate restructuring and financing.

During 2000 – 2004 he acted as the Head of the Legal Department of the Hellenic Telecommunications and Post Commission (ΕΕΤΤ), and during 2005 - 2006 he served as a Board member in the Board of Directors of ΕΕΤΤ. From 2004 up to 2007 he was a member of the Board of Directors of the Hellenic Copyright Organization (OPI), and from 2009 up to 2011, he acted as Vice-Chairman of the Board of Directors of the Hellenic Industrial Property Organisation (OVI). He has participated in various legislative committees (working on the drafting of legislation for societees anonymes, public procurement, electronic public procurements, consumer protection, intellectual property, electronic communications and competition).

Since 2003 he teaches electronic communications law in the Interdepartmental Post-Graduate Program of the Department of Informatics and Telecommunications and the Department of Economics of the National & Kapodistrian University of Athens, «Management and Economics of Telecommunication Networks». He has various publications on issues of commercial law in academic journals and in foreign newsletters on competition law and corporate law.