Professional Service
- National Research Council, National Academy of Science: Member, Space Science Board, Committee on Planetary Biology and Chemical Evolution, 1982-1984, 1985-86, 1991-1995
- Task Group of Major Directions for Space Science: 1995-2015, Life Sciences Committee 1984-1985
- Planetary Protection Committee, 1991-1995
- Member, Marine Board, Panel on Fates and Effects of Drilling Muds and Cuttings in the Marine Environment, 1982-1983
- Review Board for Research on Organotin antifouling coatings, U. S. Navy, 1985-1986
- Science Advisory Committee, Robert S. Kerr Environmental Research Laboratory, U. S. Environmental Protection Agency, 1983, 1985
- National Science Foundation, Biological Oceanography Panel 1980-1983
- American Institute of Biological Science, NASA Panel for program on Global Habitability, 1983-1985
- American Water Works Association Research Foundation Project Advisory Committee, 1990-1992
- US EPA Bioremediation Risk Assessment Panel, 1993-1995
- Advisory Board, Annual Review of Microbiology, 1988-1992
- Scientific Advisory Panel, NSF Center for Microbial Ecology, Michigan State University, 1989-1995
- NSF Center for Biofilm Engineering, Montana State University, 1987-1996
- National Water Research Institute Advisory Board, 1993-2006
- Project Advisory Committee, Americam Water Works Association Research foundation, 1992-1996
- Technical Advisory Committee, Strategic Environmental Research and Development Program (SERDP), 1996-2000
- Natural Attenuation Program (SERDP) 1996-1999