Grier started his career as an
electrical engineer for MIT from 1934 to 1947. While working on
aerial photography for Edgerton during World War II, Grier joined the
Manhattan Project and built the firing mechanism used in the
Fat Man bomb. After forming
EG&G with Edgerton and Germeshausen in 1947, Grier was involved in nuclear tests between the late 1940s and early 1950s. These included
Operation Sandstone,
Operation Ranger and
Operation Ivy. With EG&G, Grier was the company's president until 1976 and was a consultant from 1983 to 1994. Other executive roles Grier had were president of CER Geonuclear Company from 1965 to 1983 and chairman of Reynolds Electrical & Engineering Company from 1969 to 1971. Outside of electrical engineering, Grier was selected for a 1973
NASA advisory board on safety that reviewed
Skylab. He also led a 1980 safety committee that assessed the preparation of the first NASA
Space Shuttle. == Awards and honors ==