Siegfried Knasmuller is head of the Chemoprevention Group at the Institute of Cancer Research. Having obtained his academic degrees from the Vienna University he continued his studies in the fields of genetic toxicology and cancer research at the University of Leiden, Case Western Reserve University, at US EPA in North Carolina and at the Institute of Experimental Cancer Research in Innsbruck before taking up his present appointment at the Medical University of Vienna. Prof. Knasmuller authored over 160 scientific publications and organized several international conferences on cancer chemoprevention and antimutagenesis and is member of the editoral board of a number of scientific journals such as Mutation Research, Mutagenesis and Food and Chemical Toxicology.