From 1997 to 2010, he participated in the meetings of the Bilderberg Group as a steering committee member. A member of the board of the Hellenic Foundation for European and Foreign Policy (ELIAMEP) from 1999 to 2013, he is since an Honorary Committee member. He is also a member of the Brookings Institution’s International Advisory Council. He is Trustee of the A. G. Leventis Foundation and president of its Greek Committee since 1981. A co-founder of The Hellenic Initiative, David is one of the five entrepreneurs who established this non-profit, non-governmental organization with the aim of supporting Greece and Cyprus in the aftermath of the financial crisis, by helping to foster entrepreneurship in both countries. He is also a Member of Leadership 100.