Murray Gell-Mann (; September 15, 1929 – May 24, 2019) was an American theoretical physicist who played a preeminent role in the development of the theory of elementary particles. Gell-Mann introduced the concept of quarks as the fundamental building blocks of the strongly interacting particles, and the renormalization group as a foundational element of quantum field theory and statistical mechanics. He received the 1969 Nobel Prize in Physics for his contributions and discoveries concerning the classification of elementary particles and their interactions. Gell-Mann played key roles in developing the concept of chirality in the theory of the weak interactions and spontaneous chiral symmetry breaking in the strong interactions, which controls the physics of the light mesons. In the 1970s he was a co-inventor of quantum chromodynamics (QCD) which explains the confinement of quarks in mesons and baryons and forms a large part of the Standard Model of elementary particles and forces.
Life and education
Gell-Mann was born in Lower Manhattan to a family of Jewish immigrants from the Austro-Hungarian Empire, specifically from Czernowitz in present-day Ukraine. His parents were Pauline (née Reichstein) and Arthur Isidore Gelman, who taught English as a second language. Gell-Mann married J. Margaret Dow in 1955; they had a daughter and a son. Margaret died in 1981, and in 1992 he married Marcia Southwick, whose son became his stepson. Gell-Mann graduated valedictorian from the Columbia Grammar & Preparatory School aged 14 and subsequently entered Yale College as a member of Jonathan Edwards College. At Yale, he participated in the William Lowell Putnam Mathematical Competition and was on the team representing Yale University (along with Murray Gerstenhaber and Henry O. Pollak) that won the second prize in 1947. Gell-Mann graduated from Yale with a bachelor's degree in physics in 1948 and intended to pursue graduate studies in physics. He sought to remain in the Ivy League for his graduate education and applied to Princeton University as well as Harvard University. He was rejected by Princeton and accepted by Harvard, but the latter institution was unable to offer him needed financial assistance. He was then accepted by the Massachusetts Institute of Technology (MIT) and received a letter from Victor Weisskopf urging him to attend MIT and become Weisskopf's research assistant. This would provide Gell-Mann with the financial assistance he required. Unaware of MIT's eminent status in physics research, Gell-Mann was "miserable" and said he first considered suicide. Gell-Mann received his Ph.D. in physics from MIT in 1951 after completing a doctoral dissertation, titled "Coupling strength and nuclear reactions", under the supervision of Weisskopf. Subsequently, Gell-Mann was a postdoctoral fellow at the Institute for Advanced Study at Princeton in 1951, and a visiting research professor at the University of Illinois at Urbana–Champaign from 1952 to 1953. He was a visiting associate professor at Columbia University and an associate professor at the University of Chicago in 1954–1955, before moving to the California Institute of Technology, where he taught from 1955 until he retired in 1993. Gell-Mann died on May 24, 2019, at his home in Santa Fe, New Mexico.
Professional life and controversies Gell-Mann was the Robert Andrews Millikan Professor of Theoretical Physics Emeritus at California Institute of Technology as well as a university professor in the physics and astronomy department of the University of New Mexico in Albuquerque, New Mexico, and the Presidential Professor of Physics and Medicine at the University of Southern California. He was a member of the editorial board of the Encyclopædia Britannica. Gell-Mann was on sabbatical at the Collège de France for the academic year 1958–1959. Gell-Mann spent several periods at CERN, the laboratories of the European Organization for Nuclear Research in Geneva, Switzerland, including time as a fellow of the John Simon Guggenheim Memorial Foundation. In 1972, he was on CERN's payroll as visiting professor. That same year, Gell-Mann was criticized for his involvement with JASON, a scientific advisory group that supported the U.S. Department of Defense during the Vietnam War. His association with the group was the focus of protests in France and Italy. In 1984 Gell-Mann was one of several co-founders of the Santa Fe Institute—a non-profit theoretical research institute in Santa Fe, New Mexico intended to study various aspects of a complex system and disseminate the notion of a separate interdisciplinary study of complexity theory. In his 1994 popular book The Quark and the Jaguar: Adventures in the Simple and the Complex, Gell-Mann acknowledged financial support from Jeffrey Epstein, who contributed via the Santa Fe Institute. In 2003, Gell-Mann also contributed a letter to The First Fifty Years, a collection of birthday greetings for Epstein. Years later, in 2011, Gell-Mann reportedly attended the "Mindshift Conference" on Epstein's private island, Little Saint James. The gathering was organized by Epstein and science promoter Al Seckel. Gell-Mann's name also appeared in Epstein's so-called "black book," a personal address book listing Epstein's close contacts. In 2025, Ghislaine Maxwell testified that Gell-Mann had originally been introduced to Epstein through her. George Johnson has written a biography of Gell-Mann, Strange Beauty: Murray Gell-Mann, and the Revolution in 20th-Century Physics (1999), Although Gell-Mann himself criticized Strange Beauty for some inaccuracies, with one interviewer reporting him wincing at the mention of it, the book was acclaimed by a number of his colleagues. A revised second edition was published in 2023 by the Santa Fe Institute Press with a foreword by Douglas Hofstadter. In 2012 Gell-Mann and his companion Mary McFadden published the book Mary McFadden: A Lifetime of Design, Collecting, and Adventure.
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