Charles has a PhD in Geochemistry and over 20 years' experience as an industrial hygienist, and was one of the first in France to obtain the CIH certification (Certified Industrial Hygienist). Charles first worked as an expert in the assessment and prevention of radiological risk for environment at SSRE, before joining BRACE Ingénierie to develop their Department for occupational and industrial exposure to asbestos. He was then Head of the Industrial Hygiene Department and Agency Manager at ITGA, CARSO group, for more than 10 years. He joined CEHTRA in 2009 developing exposure scenario in REACH dossiers and e-SDS. Through audits and other site studies, and using current models in risk assessment, he has gained a large experience in many industrial sector activities and acquired a unique understanding of health and safety industrial culture.