Stelios' passionate commitment to the marine environment is manifested by his involvement with CYMEPA, an association he founded in 1992 and continues to support.  Their efforts include raising awareness of the health and protection of the marine environment all around the island of Cyprus and developing programs which aim to educate members of the shipping industry, school-children and the general population of Cyprus.

Similarly, Stelios' involvement in the WWF has been long and strong since helping to found WWF in Greece.  Stelios continues to support the WWF in the UK, having recently been nominated to the organization's Council of Ambassadors.  He is also a member of WWF International's 1001: A Nature Trust & Major Donors.