Bachelor of Science with 1st class honours, University Sheffield, England, 1978. Doctor of Philosophy, University Sheffield, England, 1981.
Research scientist, University of California, Berkeley, 1981-1983; lecturer soil microbiology, U. Aberdeen, Scotland, 1983-1990; senior lecturer, U. Aberdeen, Scotland, 1990-1993; reader, U. Aberdeen, Scotland, 1993-1995; professor, U. Aberdeen, Scotland, since 1995. Science representative on terrestrial science committee North American Electric Reliability Corporation, United Kingdom, since 1995.
Science advisor Organization of European Cooperation and Development, Paris, since 1990, International Atomic Energy Authority, Vienna, 1986-1990. Fellow American Academy Microbiology. Member Forest Ecology Research Network, British Soil Science Society M C.
Married Pauline Jane Johnson, July 26, 1986.