1674-1976 I was Head of the Medical Research Group, ational Health and Medical Research, Department of Occup- Dow Chemical USA, Freeport, Texas. The primary effort of my group was the cytogenetic monitoring of chemically-exposed workers as a means of detecting persons in contact with mutagenic/carcinogenic agents. I supervised the research of eight technicians, and we screened over 1,000 workers annually (5,000 workers total). Other projects revolved around our ability to detect mutagenic/carcinogenic compounds in animal test systems and the development of additional genetic test systems. I also supervised collaborative research projects with several universities. 1°73-1974 Postdoctoral Training in Biochemistry in the Molecular Hemato- locy Branch, National Heart, Lung and Blood Institute, National Institutes of Health, Bethesda, Maryland. Training included the stucy of cell-free transcription of mammalian chromatin, the mechanism of action of ribonucleic acid-directed deoxyribonucleic acid polymerase (reverse transcriptase), ribonucleic acid-deoxyribonucleic acid hybridization studies, nucleic acid Sizing techniques on polyacrylamide gels, and the cytogenetic evaluation of human marrow-mouse erythroleukemia hybrid cells. . 1973 . Postdoctoral Training in Experimental Embryology in the Depart- ment of Zoology, Oxford University, England. Training included the study of the recovery, isolation and culture of mammalian eggs at varying stages of development. 1970-1973 Doctoral Training in Genetics in the Molecular Hematology Branch, National Heart, Lung and Blood Institute, National Institutes of Health, Bethesda, Maryland. Training included the preparation of rabbit reticulocyte and liver ribosomes, the corresponding protein synthesis initiation factors, globin messenger ribonucleic acid, E. coli and rabbit transfer ribonucleic acids, reticulocyte aminoacyl-transfer ribonucleic acid synthetases; investigation of molecular weight estimations by gel filtration chromatography, sucrose density gradient centrifugation, protein and nucleic acid content determinations; study of eukaryotic protein biosynthetic initiation and elongation factors, and ribosomal-bound protein kinase; and the examination of the tissue specificity of the protein synthesis initiation factors.