Our executive management team brings together a wealth of knowledge and experience from across the chemical industry, gained in executive positions at industry leaders such as DSM, Celanese, INEOS, Monsanto and Dow Chemical. That collective chemical industry expertise, combined with the vision and support of our sole shareholder, the International Chemical Investors Group (ICIG), makes Vynova an asset to its customers.

As an essential part of our business, the Vynova Management Board is tasked with identifying business objectives and implementing strategies to achieve corporate success. That goal is accomplished by being of maximum value to our customers. We strive to make a positive impact on your chemical process and manufacturing objectives by establishing Vynova as your solutions-driven partner.


Stefan Sommer, current President of Vynova, also served as CEO of Ticona Engineering Plastics and ASK Chemicals



Stefan Sommer has over 30 years of consulting, business development and general management experience gained at various leading chemical companies. Having served as CEO of Ticona Engineering Plastics, CEO of ASK Chemicals and President of DSM China, Mr. Sommer brings abundant industry and executive expertise to the management team.

Mr. Sommer is Chairman of the European Council of Vinyl Manufacturers (ECVM) and of VinylPlus®, the European PVC industry’s voluntary commitment programme for sustainable development. In addition, he serves on the board of PlasticsEurope Germany.

Mr. Sommer has a degree in Business Economics from Ludwig-Maximilians-Universität in München (Germany). 

Luc Leunis, Executive Vice President Monomers Operations, also served as a Managing Director of INEOS ChlorVinyls Belgium



Luc Leunis leads the company’s monomers operations in Tessenderlo (Belgium), Runcorn (UK), and Wilhelmshaven (Germany). In addition, he supervises the group-wide Technology & Engineering, Human Resources and Communications processes. He has risen through the corporate ranks at Monsanto where he was charged with operations management and engineering responsibilities.

His executive leadership experience includes the position of Director of Operations for the Tessenderlo Group’s chemicals business. Before joining Vynova, Mr. Leunis was Managing Director of INEOS ChlorVinyls Belgium.

Mr. Leunis has a degree in Chemical Engineering from the Catholic University of Leuven (Belgium). 

Hans Mattheuws, Executive Vice President Finance, served as CFO and CIO of INEOS ChlorVinyls Belgium



Hans Mattheeuws heads the company’s Finance, IT, Tax and Legal activities. Before joining Vynova, he served as CFO and CIO of INEOS ChlorVinyls Belgium. Previous executive experience includes finance leadership positions at Campina and Tessenderlo Group. Mr. Mattheeuws has extensive experience serving in management and financial positions within multinational corporations as well as in smaller entrepreneurial driven environments.

Mr. Mattheeuws has a Master’s degree in Economics from the Catholic University of Leuven (Belgium) and earned his MBA and Master in Controllership from Vlerick Business School (Belgium). 

Peter Prinz, Executive Vice President Polymers Operations and worked as a managing director for INEOS ChlorVinyls



Peter Prinz leads the company’s polymers operations in Beek (The Netherlands), Mazingarbe (France) and Wilhelmshaven (Germany). In addition, he is manager of the Wilhelmshaven site and supervises the group-wide Quality, Safety, Health and Environment (QSHE) processes. He acquired substantial leadership and managerial experience as a managing director for INEOS ChlorVinyls in Germany. Mr. Prinz‘ experience also includes several operations management positions at the former EC Erdölchemie / BP Köln site (currently INEOS) in Dormagen, Germany.

Mr. Prinz is a member of the General Assembly of the trade association PlasticsEurope Germany and the German PVC industry association AGPU. He also serves as board member of VCI Nord, the regional chapter of the German chemical industry association.

Peter Prinz has a doctoral degree (Dr. rer. nat.) in Organic Chemistry from the University of Göttingen (Germany).

Johan Van Den Broeck,Executive Vice President Commercial,served as Head of Business of Limburgse Vinyl Maatschappij



Johan Van Den Broeck supervises the company’s group-wide business management, sales & marketing, supply chain and procurement activities. He has served previously as Head of Business of Limburgse Vinyl Maatschappij (LVM, historically part of Tessenderlo Group and INEOS ChlorVinyls) and business manager of the chloromethanes business with INEOS ChlorVinyls. Prior to this, Mr. Van Den Broeck held various leadership positions in IT, supply chain and purchasing with Agfa, Dow Chemical and Deloitte before serving as Supply Chain and Purchasing director at Tessenderlo Chemie.

Mr. Van Den Broeck serves on the Management Committee of the European chlorine industry association Euro Chlor.

Mr. Van Den Broeck has a degree in Commercial Engineering from the Catholic University of Leuven (Belgium).