Demetris is a fellow of the Association of Chartered Certified Accountants (FCCA) and a member of the Institute of Certified Public Accountants in Cyprus (ICPAC). He holds a BSc in Economics from Aristotle University of Thessaloniki.

Demetris has gained his experience and qualification in Grant Thornton Cyprus. During his career with Grant Thornton he progressed to a managerial position, in-charge for the audit and taxation of local and international organizations operating in various industries such as financing, trading, medical and intellectual property. He has also an extensive experience in the audit of international investment and holding companies and deep knowledge and understanding of their tax aspects.