John S. Foster Jr.

This article is about the son. For his father of the same name, see John Stuart Foster.

John S. Foster Jr.
Foster, c. 1966
Under Secretary of Defense for Research and Engineering
In office
October 1, 1965 – June 21, 1973
PresidentLyndon B. Johnson
Richard Nixon
Preceded byHarold Brown
Succeeded byMalcolm R. Currie
Personal details
BornJohn Stuart Foster Jr.
(1922-09-18)September 18, 1922
New Haven, Connecticut, U.S.
DiedApril 25, 2025(2025-04-25) (aged 102)
Santa Barbara, California, U.S.
RelativesJohn Stuart Foster (father)
EducationMcGill University (BS)
University of California, Berkeley (MS, PhD)

John Stuart Foster Jr. (September 18, 1922 – April 25, 2025) was 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.

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