AVADAR TRANSATLANTIC is a government affairs consultancy and business advisory firm with offices in Athens and New York.

In a period of volatile socio-economic changes, changing threats, emerging regional orders and geopolitical instability, any organization’s survival and development is linked directly to its capacity to understand realities and harness every available means to impact them.

In Avadar, we assist governments, corporations and non governmental organisations to navigate a complex global landscape, combining evidence-based analysis and a powerful network across Europe, the US and the Middle East.

In Avadar, we safeguard our clients’ interests, building solid relations with key stakeholders, whether it is investors, political leaders or key decision makers in the national and international level.

We link business and politics to support our clients reach the necessary networks to maximise their capacities.

In AVADAR TRANSATLANTIC, we secure that our clients achieve their strategic objectives in a world of structural disruption.


Irene Vantaraki, Managing Director of AVADAR TRANSATLANTIC, is a public and international affairs adviser and investor relations strategist. Irene has been collaborating with governments, prominent individuals and corporations across the US, Europe and the Middle East, delivering tangible results in the fields of government affairs, reputation management, and US affairs.

Previously, Irene has held senior advising posts with major corporations, including being Special Adviser to the Vice President of Motor Oil, the leading petroleum company in SEE and the Mediterranean.

Additionally, Irene was Executive Public Affairs Director at the Greek Orthodox Metropolis of Mexico, with Jurisdiction for all the Countries of Central America, the Island Countries of the Caribbean, Colombia and Venezuela, also closely collaborating with the Ecumenical Patriarchate of Constantinople.

She has also served, inter alia, as Senior Adviser with Delphi Economic Forum, the premier forum in SEE, and RIEAS (Research Institute for European and American Studies), a leading Greek institute aiming at facilitating transatlantic partnerships.

Irene is also Founder and CEO of Vandiri Art NYC, a New York-based company offering bespoke art advice and organizing high-level art exhibitions worldwide. In this context, she has partnered with such entities as Luis Vuitton NYC and Malborough Gallery.

She is also Head of International Relations and Member of the Executive Committee of Art Thessaloniki International Contemporary Art Fair as well as Board Member of the Fabien Cousteau Ocean Learning Center, a global NGO championing ocean conservation.