John is active in all fields of business law, including specialization in Corporate Law, M&As, Tax, Competition law and Arbitration (both as lawyer and arbitrator).  As a litigator he is active in the Conseil d’état, the Greek Supreme Administrative Court especially in tax litigation.
He has long experience in the area of investment incentives and privatisations, having acted in many cases either for the investor or for the Greek State.
He has also participated in law-making committees for the amendment of the legal framework regarding tax law, competition law, corporate law and privatizations.
He has been General Counsel and General Tax Counsel of the Exxon affiliates in Greece (1967- 1984) and subsequently of Shell Hellas (1984- 1996). Member of their Board of Directors and management teams.
Author of many books and articles in the areas of corporate law, investment (tax) incentives, liberalization of capital movement, competition law, accounting law.
He has delivered numerous presentations in seminars and conferences in the areas of tax law, investment incentives, corporate and competition law.