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John Wentzel is currently the CEO at Adcorp. Prior to this, they were a Research Associate and lecturer at GIBS Business School (Gordon Institute of Business Science) from July 2014 to December 2021. John also served on the faculty advisory Board of the Department of Industrial Engineering at Pretoria University (UP) and acted as external examiner at GIBS and UP. From August 2019 to March 2021, they were the Chief Executive Officer: Tsebo International at Tsebo Solutions Group.

John Wentzel's educational career began with a Bachelor of Science in Mathematics & Physics from the University of Cape Town. John followed that with a Batchelor of Science (Honours) in Nuclear Physics from the same school. Next, they earned a Master of Science in Nuclear Physics from the University of Cape Town. Finally, they completed a Doctor of Philosophy in Industrial Systems from the University of Pretoria/Universiteit van Pretoria.

Some direct reports include Bruce Toerien - Managing Director, Training, Rob De Grooth - Managing Director, Industrial, and Vinolia Singh - Chief People Officer.