Konstantine has held Executive and Non-Executive roles in Europe, and the Americas including as the Head for OASIS Carbon Management Group, and Advisor to Jai Capital, Digital Davos and Greek House Davos. Konstantine brings a distinguished track record leading organizations through successful turnarounds, commercial negotiations and deploying industry-leading innovation to strengthen relations between industry, government and civil society.  He has served as Advisor to leading think tanks, corporations in energy, and finance and non-profit organizations.

Konstantine is a frequent speaker on Greece US ties and on entrepreneurship, and professional development. He also serves as Vice President and Member of the Board of Eastern Mediterranean Business Culture Alliance (EMBCA), a leading Hellenic American organization, and heads its Hellenic Shipping Memorial and Energy committees and is a member of the biggest AHEPA Chapter in the world Delphi 25 Manhattan.