Marios obtained his BA degree in Accounting & Finance with First Class Honors in 2003 and then earned a scholarship to attend the Executive MBA programme which he completed with Distinction in 2004, both from Lancaster University in the UK. He then joined KPMG Cyprus and in 2007 he qualified as Chartered Accountant and became a Member of the Association of Chartered Accountants of England and Wales (ACA) and Member of the Institute of Certified Public Accountants of Cyprus (ICPAC). In 2017 he also received his Certificate of Fellowship (FCA).

Marios worked for KPMG as Senior Manager for 7 years being responsible for audits and advisory work. In February 2011 Marios joined the Vitol Group and specifically VTTI BV, the oil storage terminal arm of the group. Marios was appointed as the Finance Director for VTTI Cyprus, the $300million state of the art oil storage terminal and jetty located in Mari, Cyprus. During the 12 years working for VTTI Cyprus Marios was involved in the process of obtaining the necessary terminal related permits and licenses, finding appropriate land for construction purposes, supervising the construction from a project controlling point of view, recruiting terminal staff and then operating the terminal with key focus in Accounting, Finance, Treasury, Strategy and Risk Management, as well as being heavily involved in the Business Development and Commercial side of the business. From 2020 until 2022 Marios was also supporting the wider VTTI BV group in finance related projects.

Marios joined Curzon Uranium Ltd in June 2022 as Chief Financial Officer.