John S. Foster Jr. | |
|---|---|
 Foster Jr., c. 1966 | |
| Under Secretary of Defense for Research and Engineering | |
| In office October 1, 1965 – June 21, 1973 | |
| President | Lyndon B. Johnson Richard Nixon |
| Preceded by | Harold Brown |
| Succeeded by | Malcolm R. Currie |
| Personal details | |
| Born | John Stuart Foster Jr. September 18, 1922 New Haven, Connecticut, U.S. |
| Education | University of California, Berkeley (PhD) |
| Occupation | Physicist |
John Stuart Foster Jr. (born September 18, 1922) is an American physicist, best known as the fourth director of Lawrence Livermore National Laboratory and as Director, Defense Research and Engineering under four Secretaries of Defense and two Presidents.