Bernhard Müller was Manager of Research and Development for Mueller Solartechnik in Offenheim, Germany. He is the inventor of the Pil Kaar, Kundu Kaar, Zèbre and Mata Hari solar cookers and modified the solar cookplace Primrose of Roger Bernard. Bernhard is a founding member of the Solar Cookers World Network, a member of American Society of Agricultural and Biological Engineers (ASABE), and supporting member of EG-Solar e.V.
The solar cooker production ended in 2012 (retirement). As per November 2012 Bernhard Müller limits his activities to consulting, independent solar cookers tests and publication of information on solar cooking.