Dr Zietsman has been working in pyrometallurgy for more than 30 years, in industry, research and academia. He founded Ex Mente in 2001, and is a research associate in the O?ice of the Dean, Faculty of Engineering, Built Environment and IT, at the University of Pretoria, where he guides Master's and Ph.D. students. He works on computational thermochemistry; computational modelling of materials, processes, and reactors; process and reactor design; and the development of new sustainable pyrometallurgical production technologies. He has a Ph.D. in metallurgical engineering from the University of Pretoria, and has published articles at peer-reviewed conferences and in refereed journals.