Lecturer in biology Leeds Technology College, 1962-1963. Research associate University Wisconsin College Pharmacy, Madison, 1964-1965. Research associate department microbiology University Illinois, Champaign-Urbana, 1965-1967.
Assistant professor microbiology department University Texas, Austin, 1967-1968, 69-71, associate professor microbiology department, 1971-1975, professor microbiology department, 1975-1988, director Center for Applied Microbiology, 1981-1988. Edwin B. Green professor biocatalysis and microbiology College Medicine, University Iowa, Iowa City, 1988—2004. Retired, 2004
Research biochemist pharmaceuticals division Imperial Chemical Industries Ltd., Aderley Park, Cheshire, England, 1968-1969.
Latin America visiting professor National Polytechnic Institute, Mexico City, 1976. Member microbial chemistry study section National Institutes of Health, 1977-1980. Member science advisory board Applied Molecular Genetics, 1981-1988.
Member various university committees.
Fellow American Association for the Advancement of Science. Member American Society for Microbiology (Foundation lecturer 1981-1982, Procter and Gamble award in appled and environmental microbiology 1997), American Chemical Society, Society for Industrial Microbiology, Federation American Societies for Experimental Biology, American Academy Microbiology (member nominating committee 1988-1990), National Academy of Sciences, Sigma Xi, Phi Kappa Phi.
1962 - 1963
1964 - 1965
1965 - 1967
1967 - 1968
1988 - 2004
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