Hans Drexler is head of the working group "Setting of Threshold Limit Values in Biological Materials" of the Commission for the Investigation of Health Hazards of Chemical Compounds in the Work Area and Director of the Institute and Outpatient Clinic of Occupational, Social and Environmental Medicine of the University of Erlangen-Nuremberg (Germany). He is board member of the International Society of Environmental Medicine (ISEM) and Editor-in-chief of the International Archives of Occupational and Environmental Health.