Research associate Rockefeller University, 1959-1960. Assistant professor zoology Columbia University, 1960-1963, associate professor, 1963-1965. Associate professor biochemistry and biophysics University Pennsylvania, Philadelphia, 1965-1970, professor biology, 1970-2000, professor emeritus, since 2000.
Adjunct professor molecular, cellular and developmental biology University Colorado, 1969-1984. Member molecular biology study section National Institutes of Health, 1969-1973. International visiting professor Ministry Education, Science and Culture Gunma (Japan) University Medical School, Maebashi, 1992-1995.
Biomedical research technical review committee National Institutes of Health, 1994-2000. Member Mayor's Science and Technology Advisory Council, Philadelphia, 1972-1980. Chairman Gordon Research Conference on Muscle, 1983.
Extension evaluation committee National Institute Physiological Science, Okazaki, Japan, 1997. Consultant Leica Microsystems, since 2002.
- Techniques in Microscopy for Biomedical Applications (Manuals I Nbiomedical Research)
- The second volume of the series "Manuals in Biomedical Research", this book is aimed to be both a concise introduction to the diverse field of microscopy and a practical guide those who require the use of microscopic for methods in their research.
- Editor: Third and Fourth Conferences on Cellular Dynamics, New York Academy of Sciences, 1967, First and Second Conferences on Cellular Dynamics, 1968, American Physiological Society Handbook on Skeletal Muscle, 1983. Member editorial board Tissue and Cell, since 1969, Journal Cell Biology, 1970-1973, Pitman Series in Cellular and Development Biology, 1977-2000, Microscopy Research and Technique, 1982-1993, Advances in Optical and Electron Microscopy, since 1983, Neuroimage, 1991-1995, Journal Microscopy, 1992-1996, Bioimages, since 1993. Contributor articles to professional journals.
Trustee Keith R. Porter Endowment for Cell Biology, Merion Station, Pennsylvania, 1981–2004. Fellow American Association for the Advancement of Science, Electron Microscopy Society of America (council 1975-1978, president 1982), American Society Cell Biology (program chairman 1965, council 1966-1969), Biophysics Society (program chairman 1976, council 1976-1980, executive committee 1976-1982, president 1981-1982), International Union Pure and Applied Biophysics (council 1978-1984, vice president 1984-1987, president 1987-1990, chairman commission on cell and membrane biophysics 1981-1984, honorary vice president 1990-1993), Physiological Society (England). Member International Society Stereology (international stereology software committee 1982-1994), Society General Physiologists.
1959 - 1960
1965 - 1970
1969 - 1984
1969 - 1973
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