Welcome to Ex Mente, Dr Johan Heyns

Johan Zietsman


It is with gratitude and excitement we announce that Dr Johan Heyns will be joining the Ex Mente Technologies team from the 1st of August 2020. We are grateful because our team can keep on growing and becoming stronger, despite the impact of COVID-19 in our industry and the worldwide economy. We are excited because Johan has been a colleague and friend for several years, and we share many of the same values and dreams for the future. Johan’s main focus will be to head up, strengthen, and grow our multiphysics modelling team.

After completing his Ph.D. in mechanical engineering at Stellenbosch University, Johan started his career at the CSIR. He built up extensive experience in fluid flow problems and numerical algorithm implementation. His knowledge and expertise with OpenFOAM is an excellent fit at Ex Mente since we use this open-source toolkit extensively to describe and study high-temperature processes and equipment.

More recently, Johan has been working on portfolio optimisation in the financial sector, which confirms the versatility of a strong, fundamental engineering background, and keen analytical and problem-solving skills. We are happy to welcome him back to engineering, though, this time in pyrometallurgy. High-temperature processes are certain to present fresh challenges to Johan, and he is sure to bring different perspectives to our team and our methods.

We are looking forward to advancing through insight with your contributions, Johan. Welcome to the team.

Recent Posts

Johan Zietsman


The format of the week has changed from last year to make the training more accessible and to equip attendees with the necessary knowledge and skill that will allow them to do powerful thermochemical calculations with FactSage™.


Dr Jaco Swanepoel


Jaco is a Chemical Engineer with twelve years of experience in projects that range from reactive metals handling, reactive metal powder production in molten salt slurry reactors, extractive metallurgy to microwave-assisted gas-solid materials processing.
Jaco contributed to three process patents and obtained a PhD degree in Chemical Engineering. Jaco also completed the KTP Management and Leadership Study Program at Ashorne Hill Management College, England.

Stefan van der Merwe


Stefan’s greatest passion is to enable people. By combining his greatest passion with his love for technology, he finds joy in making computing infrastructure accessible to the non-technical, and developing software that uncomplicates tasks. As a software engineer with qualifications in electronic engineering and bioengineering, Stefan is responsible for software development, enabling the team and clients to advance through insight.