In 1995, Marné graduated with a degree in Industrial Engineering. She then joined a management consulting company and worked as a consultant for seven-and-a-half years. During these years she worked as a Business and Systems Analyst where she was involved in various projects. These included: facility layout; business process engineering and procedure development; and analysis, design, testing and implementation of various systems (maintenance / decision-support / document management / bespoke).
In 2003 she joined the University of Pretoria, becoming a lecturer on Engineering Statistics, Information Systems Design and Enterprise Architecture. She also pursued her post-graduate studies in order to obtain a masters degree in Industrial Engineering. Her dissertation proposed an integrated process improvement and knowledge management maturity model for management consultancy organisations. She is currently doing research on using strategy and business architecture to drive EA efforts.