Keisuke Nansai is Research Director of the Material Flow Innovation Research Program (mfi.nies.go.jp) and Head of the Global Resource Sustainability Research Section at the Material Cycles Division at the National Institute for Environmental Studies (NIES), Japan. He is an adjunct professor at the Graduate School of Environmental Studies at Nagoya University in Japan. He is also a panel member of the International Resource Panel (IRP) of the United Nations Environmental Program. He is an editorial board member of Economic Systems Research (Taylor & Francis) and Environmental Research: Infrastructure and Sustainability (IOP publishing), also serving as an editor of Resources, Conservation & Recycling (Elsevier). He was awarded the Leontief Memorial Prize in 2007 and the Sir Richard Stone Prize in 2011 by the International Input-Output Association (IIOA). Keisuke’s expertise is environmental systems analysis based on life cycle thinking, and he has mainly applied input-output analysis, life cycle analysis and material flow analysis to sustainability assessments. Keisuke’s current research interest is the nexus of planetary health and sustainable material use, such as material criticality regarding climate change mitigation/adaptation, human health impacts via material consumption, and global material trade harmonised with the planetary health.