In 1995 I received my PhD from Wageningen University and started working at Philips Research Laboratories and Philips Lighting/Signify in Eindhoven. July 2019 I accepted a Researcher position at the Eindhoven University of Technology, in the Intelligent Lighting Institute group of Human Technology Interaction. My main interests are visual and non-visual responses to light and lighting and research into how these impact human health, circadian rhythms, wellbeing and functioning in different application contexts (workplaces, homes, education, healthcare). I‘m Director of CIE Division 6 “Photobiology and Photochemistry” of the International Commission on Illumination (CIE) , and actively contribute(d) to various standardization processes (CEN, DIN, CIE and ISO). Until December 2018 I have chaired CIE JTC9 which defined a new global standard (CIE S 026/E:2018) with new metrics to quantify optical radiation for ipRGC-influenced responses to light.