Roy is an environmental biology professor at Leiden University who works on urban nature and its importance to people, predominantly through the development and application of spatial decision-support tools. Previously, he was a postdoctoral scholar with the Natural Capital Project at Stanford University with a focus on urban ecosystem services. Roy obtained his Ph.D. at Wageningen University, the Netherlands, developing spatial models for ecosystem services and biodiversity and ecosystem accounting methods. After his research at Wageningen University worked as an ecosystem service researcher at the Dutch National Institute for Public Health and Environment where he developed spatial modelling tools for (urban) ecosystem services and at Statistics Netherlands to develop national ecosystem accounts. Roy holds an MSc diploma in Climate Studies from Wageningen University and a BSc diploma in Environmental Sciences from Utrecht University, the Netherlands.