Jochen Rentsch holds a PhD in physics from Albert-Ludwigs-Universität Freiburg and worked at Fraunhofer ISE from 2001 to 2026, focusing on silicon solar cell and production technology development. Over this period, he led both research and large-scale industrial transfer projects, building strong links between cutting-edge R&D and industry implementation. At Fraunhofer ISE, he headed a group and later a department dedicated to advancing silicon solar cell technologies and their manufacturing processes. In the last five years of his tenure, he served as Head of Technology Transfer, driving the commercialization of research results and supporting industry partners in adopting innovative renewable energy solutions. In early 2026, he became co-founder and CEO of Nexus GreenTech, a company specializing in business consultancy for renewable energy technologies. Nexus GreenTech supports companies and investors in developing, scaling, and industrializing sustainable energy technologies and value chains.