[3] Constantakopoulos was the founder and president of TEMES S.A., developers of the new destination Costa Navarino in Messinia, where he was from.

HELMEPA Junior trains young people to act as the courier of environmental messages whilst also bringing the children closer to shipping and to show them potential future career options.

In 1998 HELMEPA Junior was awarded the UNEP (United Nations Environment Programme) Global 500 prize.

In 2000, Constantakopoulos and his wife founded the Hellenic Studies Centre[8] at Peking University.

[9] Constantakopoulos served on the Boards of Directors of numerous Greek and international organizations in the maritime and other fields and received awards from the Academy of Athens, the European Union and several cities and chambers for his activities.