After his education in toxicology and environmental Health and some interim jobs. Thies Oosterwijk started as a scientist on the safe use of Chemicals and nanomaterials at TNO in the Netherlands. The focus of his work lies in nanomaterial risk assessment and safe by design strategies for industry. He is involved in various National and EU projects like NANoREG, GuideNano, NanoInsight and others. Within the NANoREG project Thies has been responsible for the scientific development of a database structure that enables the storing of data on the link between physical chemical characteristics and their toxicity for the purpose of safe by design.