Speakers & Lecturers

Here is the list of our various speakers and masterclass presenters.

Dr. Alan Barnard

CEO Goldratt Research Labs

Dr. Alan Barnard is one of the leading experts in the world in Theory of Constraints (TOC) and frequently worked with Dr. Eli Goldratt, creator of Theory of Constraints, on large and complex projects around the world. He is the CEO of Goldratt Research Labs (USA), Chairman of African Phosphates (RSA) and The Odyssey Institute (USA). Alan is also a board member of TOCICO and the Dr. Eliyahu M. Goldratt Foundation.

Contact Info:


Philip Viljoen


Philip Viljoen is a founder member of TOCPA. He has been teaching and implementing TOC as part of AGI, the Goldratt Group, TOCSA and Ruzults since 1995. He is currently the MD of RuZults and focuses on Strategy Development and Value Chain Solutions

Contact Info: 


Skype: philjoen

Mobile: +27826515977

Philip Marris

 CEO Marris Consulting

Philip Marris has been implementing the Theory of Constraints for over 30 years, in over 200 companies throughout the world. His areas of predilection are production performance and project management. He is the founder and CEO of Marris Consulting, a resulting firm created in 2005 and based in Paris France. He has worked all over the world including, whenever possible, in South Africa. His clients include: Aerosud (S.A.), ArcelorMittal, Autoliv, Bayer, Bolloré, Bosch, Bulgari, Embraer, GSK, Louis Vuitton, McDonald’s, Procter & Gamble, Rolex, Safran, Saint-Gobain, Schlumberger, Siemens, SKF, Thales, Yves Rocher & Zodiac Aerospace. He is an active contributor to TOC awareness throughout the world through his conferences, training courses, articles and videos.

Oded Cohen

International Director of TOC Strategic Solutions

Oded has over 35 years of experience in developing, teaching and implementing TOC methodology, solutions and implementation processes working directly with Dr. Goldratt all over the world. Among the countries to which Oded brings his expertise are the USA, Canada, Japan, India, China, the UK, Poland, Russia, Ukraine, Colombia, Chile, Peru, Turkey and many others.

Contact Info: 


Jelena Fedurka-Cohen

International Director of TOC Strategic Solutions

Jelena Fedurko is a Co-Founder and Co-President of TOC Practitioners Alliance TOCPA and International Director of TOC Strategic Solutions. 

Jelena has been involved in TOC since 1999. She is a TOC expert, trainer and consultant, and provides TOC implementation support in production, supply chain and project management. Jelena has worked in various countries all over the world, including Japan, Poland, Germany, Switzerland, Turkey, Italy, Russia, Ukraine, India, China, Chile, Colombia, Mexico.

Contact Info: 


David Janse van Rensburg

MD of Cargo Solutions

MD of CargoSolutions, a supply chain optimization business unit of the Cargo Carriers Group.
Focus on TOC supply chain solution implementations, and is an Implementation Partner for Inherent Simplicity’s Symphony software in SA.
Completed TOC implementations in many industries in SA, including FMCG, building supplies, extrusion, footwear, clothing and printing, distribution, etc.
TOCICO certified in Supply Chain and Logistics.

Contact Info: 

011 485 8700
083 3034183

Albert van der Wat


Albert was born and raised in Johannesburg, and completed his Industrial and Systems Engineering Degree at the University of Pretoria. I was introduced to Theory of Constraints while working for CargoSolutions, as TOC consultant and Symphony Implementer. I gained vast knowledge of how the Theory of Constraints can improve a company’s operations using TOC based planning, execution and management tools. Currently I am the supply chain manager for PERI Construction, Scaffold and Engineering in South Africa, implementing TOC based principles in supply chain, operations and Sales.

Contact Info: 

Mobile: +27 83 463 6232

Konrad Bartel

Ops Logik

Konrad Bartel studied Industrial Engineering & MBA, has 20 years experience as Production Manager / Director in the manufacturing environment and 16 years TOC Consulting experience in Marketing & Sales, Supply Chain, Manufacturing and CCPM Implementation. He worked with Goldratt Consulting on Viable Vision Projects. Konrad is also an Ontological Business Coach and implements TOC at organizations throughout South Africa and internationally

Contact Info: 

Mobile: +27 83 262 0062
Office: +27 21 843 3103

Christo Wentzel

Centurion Systems

Studied Electrical Heavy Current T3 @ Vaal University of Technology (1991 – 1993)
Worked at ISCOR Vanderbijlpark as Master Technician (1993 – 1999)
Worked at MaxID Group as Project Manager (1999 – 2011)
Own Company MyGSM www.mygsm.co.za (2011 – 2013). Bought out by Centurion System in 2013
Currently at Centurion Systems as TOC Project Manager

Contact Info: 
Email : Christo.wentzel@centurionsystems.co.za
Tel : +27 (0)11 699 2400 Ext 322

Andy Anderson


Andy Anderson is a Certified TOC Practitioner in Operations, Distribution, Strategy, Project Management and Finance. His TOC Consulting experience stretch over eighteen years, and covers both local and international companies covering a wide range of industries. Special focus areas include: Mining, Electricity and Steam Generation, the Steel Industry (from coal and iron ore mining through to retail, value adding processes and scrap recovery).
Andy was the first to apply TOC concepts to Power Generation with very good results; he presented a paper on his work to a TOC International Convention held in George.

Contact Info: 
E-mail: andy@goldratt.co.za
Cell # : 082 898 4532

Arrie van Niekerk

Tavanec CC

Arrie van Niekerk obtained his B Eng (Metal) from the University of Pretoria in 1978, he was trained as Jonah in 1993 and Jonah-Jonah in 1998. He was the project leader for the implementation of TOC in more than 90 mines and 20 manufacturing companies in South Africa and has 20 years practical experience in this field.

His key strengths are:

  • Recognized expert in the application of TOC applications
  • Developed unique solutions for enhanced Production Flow in Mining
  • Facilitator on TOC and change management
  • Skilled facilitator of Open Dialogue and Team Development as enabling processes

Contact Info: 
e-mail: arrievn@oiledwheels.co.za
Cell: +2782 452 2173

Siyabulela Ngcangca

Contracts Manager West Africa

Siyabulela Ngcangca (Known as “Siya”) is a mining engineer by profession and have worked in several countries in Africa, such as South Africa, Tanzania, Guinea Conakry & Burkina Faso. Have 16 years’ experience in mining industry, started with Lonmin in 2003.

To manage the execution of the required scope of work within the project schedules and contractual agreements, ensuring technical excellence and to deal with commercial issues.

Currently working a regional senior contracts manager in West Africa. Managing all West African mining projects and responsible for their financial performance, production performance, commercial / contractual issues, Procurement / Transportation of goods, government relations and strategic planning while minimizing risk.

Katlego Mabote

Optimisation Manager @ Lonmin

Katlego Mabote is a qualified Industrial Engineer. He is currently studying for Masters Qualification of Industrial Engineering. Katlego worked for BMW as a Quality Process Engineer Trainee. He is also a Six Sigma Black Belt. He later joined BHP Billiton where he was employed as an Operational Excellence and Business Improvement Specialist. Katlego joined De Beers and is based at De Beers Consolidated Mines Voorspoed Mine where he works as a Continuous Business Manager focusing on the climate, culture and practices of embracing people, process and system in the company. He achieved the highest CBI maturity level of 2.8 in four years.
Katlego is currently working as an Optimisation Manager for Lonmin for focusing on TOC.

Jaco Laubscher


Jaco is a Theory of Constraints1 Solutions Application Expert, currently involved with various projects in South and Southern Africa. He has been trained by Realization Inc. as a Critical Chain Implementation Expert. Jaco has a B.Eng Mechanical Engineering Degree from the University of Pretoria. Having spent 9 years in the Food and Beverage industry, dealing with large and complex multi-discipline projects, Jaco gained extensive experience in Process Engineering, Process Automation, Project Management, Contracting and Contract Management.
For the past 10 years Jaco has actively implementing Critical Chain Project Management Systems across a number of industries, ranging from IT, Construction, Maintenance, Repair and Overhaul as well as new product development environments.

Contact Info: 
+27 83 306 7145

Jeff Esterhuize

Operations Systems Manager

  • 17 years experience in manufacturing
    • Electrical industry
    • Aviation industry
  • 8 years experience in Business Systems Integration
    • ERP
    • PLM
    • MES
  • 7 Years TOC experience
    • Mentors: Konrad Bartel, Philip Marris, Bill Dettmer

Contact Info: 

Andre Tustin

CI Manager

  • Associate – Charter Institute of Management Accountants
  • 15 Years Financial Experience and CFO of Aeronautical Co.
  • Lecturer – University of Pretoria
  • 5 Years TOC experience
  • Mentors: Konrad Bartel, Philip Marris,
    Bill Dettmer & Etienne du Plooy

Contact Info: 

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