Prof. Gunnar Johanson received a PhD in toxicology at Karolinska Institutet in 1988 and became a professor of occupational toxicology and risk assessment at the same institute in 1999. He has served in various expert groups, including the Swedish Criteria Group for OELs (vice chair), the EU SCOEL committee (vice chair), the EU-LCI working group, and the AEGL committee. Since 1999, he has chaired the Nordic Expert Group for Criteria Documentation of Health Risks from Chemicals (NEG). His research interests cover several areas in toxicology, toxicokinetics, and health risk assessment, all the way from indoor air quality to workplace exposure to chemical disasters and from experimental studies in vitro with Zebrafish embryos and cell cultures to studies in vivo with human volunteers. Much focus is on experimental studies and computer modeling of dermal and inhalation exposures and on acute effects of inhaled chemicals.