**About the Editors**

**Val ´erie Fessard** (Dr.) is a toxicologist with longstanding expertise in food contaminant toxicology, especially genotoxicity, intestinal and hepatic human cell models and high-content screening for multi-parametric toxic effects. After earning a Ph.D. and a post-doctorate in ecotoxicology, she moved to human toxicology and dedicated her research to public health and hazard assessment. She has been working on engineered nanomaterials for nearly 10 years. In this context, she coordinated the French/German project SolNanoTox (2013–2017) and is/was involved in several European projects (Nanogenotox, NanoReg, Riskgone). She has been the head of the Toxicology of Contaminants unit in the French Agency for Food, Environmental and Occupational Health & Safety for 12 years.

**Fabrice Nesslany** (Dr.) is a toxicologist with longstanding expertise in regulatory genotoxicology testing. He was involved in several European projects aiming to assess the hazards and risks of nanomaterials (Nanogenotox, NanoReg1, 2). He has been the Head of the Toxicology Laboratory of Institut Pasteur de Lille for 10 years. He has numerous appointments as an expert toxicologist in French safety agencies (Agency for Food, Environmental and Occupational Health & Safety; French Agency of Human Health Products, High Council of Public Health) and participates in several specialized expert committees. He is also a French expert for OECD.
