Bachelor of Science in Physics, Polytechnic U., New York City, 1963;
Doctor of Philosophy in Physics, Brown U., 1970.
Research Associate, Massachusetts Institute of Technology, Cambridge, 1969-1971;
member research staff, Massachusetts Institute of Technology, Cambridge, 1971-1979;
principal research scientist, Massachusetts Institute of Technology, Cambridge, 1980-1982;
physicist, Smithsonian Astrophysical Observatory, Cambridge, since 1983. Member Mariner 9 Celestial Mechanics Team, Mariner Venus/Mercury Radio Science Team, Viking Radio Science Team, Pioneer/Venus Orbiter Science Steering Group, Planetary Sys. Science Working Group, 1988-1992, Ad Hoc Committee on Gravitation Physics and Astronomy, 1989-1991.
Lecturer International School Cosmology and Gravitation, 1977, 79, 82, 85. Chairman of Commission on gravitation and relativity Starprobe Mission, 1980-1981. Member Interferometry Panel of the Astronomy and Astrophysics Survey, 1989-1990.
Member Space Interferometry Mission Science Working Group, since 1996. Meeting organizer Workshop on High Angular Revolution Optical Interferometry from Space, Baltimore, 1984, Optical Society American, 1988, Society Photo-Optical Instrumentation Engineers, 1990, 93, 94, 95, 96, 97.
Member American Association for the Advancement of Science, American Astronomical Society, American Physical Society, International Astronomical Union, International Society on General Relativity and Gravitation, Sigma Xi.
Married Wendy Schoenbach, June 20, 1965. 1 child, Suzanne.