Johannes Werner
Managing Director
Head of development

Recognizing problems and develop technical solutions for them. Johannes is a textbook example of an inventor. As a chemist and IT professional, he led various scientific projects in the field of physical chemistry and energy storage. Johannes developed several patents and realized technical products, like the efficiency improvement of photovoltaic technology and our electrochemical energy converter cell. Johannes has a lot of experience in research and fundraising.

Stefan Fritzsche
Communication and sales

Understanding needs and developing tailored solutions. As an engineer for product development in sport, Stefan led major development projects in sports and worked at two Olympic Games. As an IPMA certified project manager, future energy manager and with five years experience in sales, Stefan brings a lot of experience in handling time-critical situations and different stakeholders.

Hartmut Kiesel
Legal and finance

Security and control. As a lawyer with over 20 years of experience and an expert in intellectual property, Hartmut takes care of the legal protection of all activities and contracts of GroNaS GmbH. In addition, controlling our finances is one of his main tasks.