---
id: people/george-cowan
about:
  label: George Cowan
  depiction: people/george-cowan.jpg
  depiction_credit: 'US Department of Energy, Wikimedia Commons, public domain.'
  description: >-
    Los Alamos chemist and Manhattan Project veteran who led the founding of the
    Santa Fe Institute and was its first president, from 1984 to 1991.
  tags:
    - complexity
    - history
person:
  affiliation: Santa Fe Institute
  role: chemist
relations:
  - predicate: member_of
    target: organizations/santa-fe-institute
provenance:
  origin: agent
  sources:
    - title: 'In memoriam: George Cowan (Santa Fe Institute, 2012)'
      url: 'https://www.santafe.edu/news-center/news/george-cowan-passes-away'
    - title: >-
        In Memoriam: George Cowan '41, Manhattan Project Chemist, Nuclear
        Detective, Santa Fe Institute Founder (WPI, 2012)
      url: 'https://www.wpi.edu/news/cowaninmemoriam'
    - title: George Cowan (Wikipedia)
      url: 'https://en.wikipedia.org/wiki/George_Cowan'
  created: '2026-11-02'
  reviewed: '2026-11-02'
  reviewed_by: 'Claude, from the sources listed'
  status: draft
---
George Arthur Cowan (15 February 1920 to 20 April 2012) was an American nuclear chemist.[^1,3] Born in Worcester, Massachusetts, he studied chemistry at Worcester Polytechnic Institute and worked under Eugene Wigner at Princeton on experiments to find out whether a chain reaction could be sustained in uranium.[^2] In the Manhattan Project he was moved from site to site as a troubleshooter, and was one of very few people who knew its separate components.[^1,2] He spent nearly forty years at Los Alamos National Laboratory as a scientist, director of chemistry, associate director of research and senior fellow.[^1,2] In 1949 he led the analysis of fallout samples that showed the Soviet Union had a nuclear bomb, and he later developed ways to measure the yield of hydrogen bombs, for which he received the E. O. Lawrence Award; he received the Enrico Fermi Award in 1990.[^1,2]

On the White House Science Council under President Reagan he dealt with problems that crossed science, policy, economics and the environment, and became a critic of the fragmentation of science and an early advocate of the quantitative study of complex adaptive systems.[^1] From 1982 to 1984 he was the central figure in founding the Santa Fe Institute, which began in the convent of a former parochial school. He was its first president from 1984 to 1991 and stayed on its board of trustees until his death.[^1,2] In his own research he studied nonlinear dynamics, and helped lead a brain-imaging study of children's development.[^1] He was also a founding director of Los Alamos National Bank, its chairman for thirty years, and an early board member of the Santa Fe Opera.[^1]

The [Santa Fe Institute](/organizations/santa-fe-institute/) entry tells how it grew out of weekly discussions he held with senior colleagues at Los Alamos from 1982, which [David Pines](/people/david-pines/) and [Murray Gell-Mann](/people/murray-gell-mann/) joined.