–Professor of Public Law at the School of Law of the National University of Athens (N.U.A.)
-ex Rector of the N.U.A.
-ex Member of the Greek Parliament
–Honorary Professor of the School of Law of the Demokriteion University
-President of the Greek Association of the Energy Law
-Judge at the General Court of the European Union
–Professor, European Chair Jean Monnet on EU Law & Policies (Competition, Energy & Transport), University of Piraeus
-ex Legal Counsel of the state Gaz provider DEPA
-Professor of Energy and Resources Law at the Macquarie Law School (Sydney)
-ex Director of the Aberdeen University Center for the Energy Law
-Ass. Professor of International Law at the School of Law of of the Geneva University
-United Nations Expert regarding Exclusive Economic Zone issues
-Professor of Risks Evaluation,
-Dean of the School of Business Administration of the European University Cyprus (E.U.C.)
-Dean of the School of Law of the E.U.C.
-Member of the Board of Directors of the Open University
-Member of the Greek Energy Regulatory Agency
–Ass. Professor of Constitutional Law at the School of Law of E.U.C.
-ex Member of the Greek Parliament
-ex Minister of Foreign Affairs
-Alexander von Humboldt Fellow, University of Hamburg –
-Assistant Professor, The Fletcher School of Law and Diplomacy –
-Associate Editor, The Journal of World Energy Law & Business