Marius matriculated at Waterkloof High School in Pretoria. He obtained a B Com (Acc) degree from the University of Pretoria, followed by B Comm. (Acc) (Hons). He qualified as a Chartered Accountant and completed his learnership with Coopers & Lybrand (presently known as PricewaterhouseCoopers) in Pretoria.
Marius is currently a Chartered Accountant (SA) and a Registered Auditor (SA), as well as a member of the South African Institute of Professional Accountants (SAIPA). He is married to Ellouie and they have three sons.