Center Director (1994-1995), NASA Johnson Space Center
Director, Space and Life Sciences (1987-1995)
Associate Center Director (1984-1987)
Special Assistant to Director (1984)
Deputy Chief for Personnel Development, Astronaut Office (1978-1984)
Member, Astronaut Selection Boards (1978, 1980, 1984, 1985, 1987)
Chief, Biomedical Laboratories Branch, Space and Life Science Directorate (1977-1984)
Chief, Space Metabolism and Biochemistry Branch (1976-1977)
Special Technical Assistant to Director (1976)
Head, Endocrinology and Biochemistry Laboratories (1974-1976)
Senior Research Physiologist (1970-1976)
Assistant Secretary of Environmental Management, U.S. Department of Energy
Executive in Residence, George Washington University Project Management Program on special assignment as Special Assistant to NASA Administrator and
Office of Science and Technology Policy, White House
