Master of Arts, Cambridge University, England, 1973. Doctor of Philosophy, Cambridge University, England, 1976.
Senior investigator National Institutes of Health, Bethesda, Maryland, since 1989. Science editor Journal Microscopy, Oxford, England, since 2000. Chief, laboratory bioengineering, physical science National Institute biomedical Imaging & Bioengring., Bethesda, Maryland, since 2006, science director, since 2006.
Fellow: Royal Microscopical Society. Member: Microbeam Analysis Society, Microscopy Society America, American Physical Society.
Married Gisele Gildener, October 28, 1979. Children: Neil, Michael, Juliana.