Kay Cesar received his Ph.D. related to solar fuels from the École Polytechnique Fédérale de Lausanne (CH) for which he was awarded the 'DuPont Material award' for excellent research in the field of material science. After his Ph.D. he joined the research institute ECN in 2007 and worked on the industrialization of silicon solar cells and modules. He is a specialist on device physics and industrial process development from idea to pilot production. Since 2016, he is involved in scenario sketching of future PV systems including cash flow evaluations for national and multinational companies. From 2019 onwards, he is chair of the Dutch 'Nationaal Consortium Zon in Landschap' which is a knowledge network for research and innovation for solar parks on land. This network aims at better integrating the values of ecology, agriculture, spatial quality and grid integration into the solar parks design of the near future. He is currently leading several national projects, investigating the effect on ecology and PV performance by the design and maintenance of existing and future solar parks with the aim of making them eco-positive.