Demetris holds a BSc. in Computer Science and Accounting (Joint Honours) and is a fellow member of the Institute of Chartered Accountants in England and Wales (ICAEW) in London. He is a Board member of KPMG since 1991, First Vice Chairman of the Board of the Employers and Industrialists Federation of Cyprus (OEB), President of the Cyprus Organization for Standardisation, member of the Institute of Certified Public Accountants of Cyprus and of the Cyprus Institute of Internal Auditors of Cyprus, member of the Tech Board of the Institute of Chartered Accountants in England & Wales and member of the Advisory Board for the School of Economics and Management of the University of Cyprus.