Leo Marcelis is a professor in Crop Production in Low-Energy Greenhouses at Wageningen University, The Netherlands. He is leading the research team Crop Management, Physiology and Modelling of Wageningen UR Greenhouse Horticulture, a research unit of 120 researchers within Wageningen UR that focusses on innovation in protected cultivation. He has over 25 years of experience in experimental and simulation research on plant growth in controlled environments such as greenhouses and climate rooms. He has (co-) authored more than 120 scientific articles. Prof. Marcelis operates in close collaboration with other departments within Wageningen UR in developing reliable and complete food systems.