Majorie van Duursen is Professor in Environmental Health and Toxicology and Head of the Department of Environment and Health at the VU. She has been principal investigator of various (inter)national projects on the endocrine-modulating effects of chemicals with a special emphasis on women’s health and the developing child. In her research, she develops and applies in vitro models, using 3D cultured (primary) human cells in a relevant tissue microenvironment to increase the mechanistic understanding of how chemicals can modulate biological pathways, specifically steroidogenesis. Prof. van Duursen is coordinator of the H2020 EU-funded project FREIA, which aims to improve testing methods for the identification of endocrine disruptors that affect female reproductive health. She is chair of the standing subcommittee Classification of Substances Toxic to Reproduction and Development of the Health Council of the Netherlands. She participates in, and is an advisor to, various national and international organizations and committees related to environmental health issues, for example of the European Chemicals Agency (ECHA) and European Food and Safety Authority (EFSA). She is a member of the editorial board of Toxicological Sciences, Current Opinion in Toxicology, and Regulatory Toxicology and Pharmacology. She is a member of the Dutch and US Societies of Toxicology and the European Society of Endocrinology.