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Mary Tsingou | |
|---|---|
 Tsingou-Menzel at the Los Alamos National Laboratory in 1955 | |
| Born | Mary Tsingou October 14, 1928 Milwaukee, Wisconsin, U.S. |
| Died | August 27, 2026 (aged 97) Los Alamos, New Mexico, U.S. |
| Citizenship | United States |
| Education | University of Wisconsin University of Michigan |
| Known for | Fermi–Pasta–Ulam–Tsingou problem |
| Scientific career | |
| Fields | Physics Scientific computing |
| Workplaces | Los Alamos National Laboratory |
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Mary Tsingou-Menzel (October 14, 1928 – August 27, 2026) was an American physicist and mathematician of Greek-Bulgarian descent.[1] She was one of the first programmers on the MANIAC computer at Los Alamos National Laboratory and is best known for programming the simulations for the celebrated computer experiment with Enrico Fermi, John Pasta, and Stanisław Ulam. This experiment became an inspiration for the fields of chaos theory and scientific computing, and was a turning point in soliton theory.
Background
Mary Tsingou was born in Milwaukee, Wisconsin, on October 14, 1928, her Greek parents having moved to the United States from Bulgaria. In the aftermath of the Great Depression, the family left the U.S. to spend several years in Bulgaria. In 1940, they returned to the States, where Tsingou attended high school and college. She graduated with a bachelor's degree in mathematics and education in 1951 from the University of Wisconsin. She then studied at the University of Michigan, receiving a master's degree in mathematics in 1955. In 1958, she married Joseph Menzel.[2] She had two daughters, Ann and Carol,[3] who grew up to be medical doctors.[1]
Tsingou died at her home in Los Alamos, New Mexico, on August 27, 2026, at the age of 97.[3]
Career
Tsingou joined the theoretical division of the Los Alamos National Laboratory, where she became one of the first programmers on the MANIAC. Besides working on weapons, the group also studied fundamental physics. Following Fermi's suggestion to analyze numerically the predictions of a statistical model of solids, Tsingou came up with an algorithm to simulate the relaxation of energy in a model crystal, which she implemented on the MANIAC.[2] The analysis became known in the computational physics community as the Fermi–Pasta–Ulam problem (FPU). In 2008, Tsingou's contributions were recognized and the analysis was renamed as the Fermi–Pasta–Ulam–Tsingou problem (FPUT).[4][5] The result was an important stepping stone for chaos theory.[6]
After Fermi's death, James L. Tuck and Tsingou-Menzel repeated the original FPUT results and provided strong indication that the nonlinear FPUT problem might be integrable.[7]
Tsingou-Menzel continued her computational career at Los Alamos. She was an early expert on Fortran. In the 1980s, she worked on calculations for the "proton storage ring" in the Star Wars program (the Strategic Defense Initiative), which was one of President Ronald Reagan's projects.[1][8] She retired in 1991.[2]
Recognition
The 1955 Los Alamos report named Fermi, Pasta, and Ulam as its authors, but separately stated that the work had been done by Fermi, Pasta, Ulam, and Tsingou; it also thanked Tsingou for coding the problems and running the computations on the MANIAC.[9] Despite that explicit credit, the experiment was known for more than half a century as the Fermi–Pasta–Ulam (FPU) problem. It was not until 2008, when an article published in Physics Today by physicist Thierry Dauxois drew renewed attention to Tsingou's role and called for the problem to be renamed FPUT; the expanded name has since entered scientific usage.[2][6] Subsequent publications referencing the FPUT problem reflect this change.[10][2] In 2020, National Security Science magazine, published by Los Alamos National Laboratory, featured an article on Tsingou that included her commentary and historical reflections on the FPUT problem. The article was titled "We thank Miss Mary Tsingou" in reference to the acknowledgement that appeared on the title page of the original FPUT technical report from 1955.[8]
Publications
- J. L. Tuck; M. T. Menzel (December 1972). "The superperiod of the nonlinear weighted string (FPU) problem". Advances in Mathematics. 9 (3): 399–407. doi:10.1016/0001-8708(72)90024-2. OCLC 4922300485.
- Devaney, Joseph J.; Petschek, Albert G.; Tsingou Menzel, Mary (1958). On the Production of Heavy Uranium Isotopes in a Very High Density Fast Neutron Flux. Los Alamos Scientific Laboratory of the University of California. OCLC 696158179. OSTI 4291017.
See also
References
- Menzel, Mary Tsingou (January 26, 2021). "Oral-History: Mary Tsingou Menzel". Engineering and Technology History Wiki (Interview). Interviewed by Abbate, Janet. Retrieved October 10, 2026.
- Dauxois, T. (January 2008). "Fermi, Pasta, Ulam, and a mysterious lady" (PDF). Physics Today. 61 (1): 55. arXiv:0801.1590. Bibcode:2008PhT....61a..55D. doi:10.1063/1.2835154. S2CID 118607235.
- Sarpomaa, Ama (October 10, 2026). "Mathematician Who Waited 50 Years for Proper Credit for Her Work Has Died". The New York Times. Retrieved October 10, 2026.
- Fermi, E.; Pasta, J.; Ulam, S. (May 1955). "Studies of Nonlinear Problems". doi:10.2172/4376203. OSTI 4376203. Document LA-1940. Retrieved April 11, 2024. Also appeared in Collected Works of Enrico Fermi, University of Chicago Press, Vol. II, 978–988 (1965).
- Fermi, E. et al. (1955). _______ . Front page: "Work done by: E. Fermi J. Pasta S. Ulam M. Tsingou"; and footnote: "We wish to thank Miss Mary Tsingou ... for running the computations on the Los Alamos MANIAC machine, ..."
- Waldvogel, Miriam (September 5, 2026). "Her work was key to a landmark experiment. She was credited in a footnote". The Washington Post. Retrieved September 5, 2026.
- Tuck, J. L.; Menzel, M. T. (1972). "The Superperiod of the Nonlinear Weighted String (FPU) Problem". Advances in Mathematics. 9 (3): 399–407. doi:10.1016/0001-8708(72)90024-2.
- Grant, Virginia (2020). "We thank Miss Mary Tsingou". National Security Science. Archived from the original on September 29, 2024.
- Fermi, Enrico; Pasta, John; Ulam, Stanisław (May 1955). Studies of Nonlinear Problems (Report). Los Alamos Scientific Laboratory. doi:10.2172/4376203.
- Dauxois, T.; Ruffo, S. (2008). "Fermi-Pasta-Ulam nonlinear lattice oscillations". Scholarpedia. 3 (8): 5538. Bibcode:2008SchpJ...3.5538D. doi:10.4249/scholarpedia.5538.
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Mary (Tsingou) Menzel — Pioneering Physicist and Mathematician
Mary (Tsingou) Menzel (October 14, 1928 – August 27, 2026) was an American physicist, mathematician, and one of the first programmers of the historic MANIAC computer at Los Alamos National Laboratory .
Early Life and Education
Born in Milwaukee, Wisconsin, to Greek immigrant parents, Tsingou spent part of her childhood in Bulgaria before returning to the U.S. in 1940 . She earned a B.A. in mathematics and education from the University of Wisconsin in 1951, followed by a M.A. in mathematics from the University of Michigan in 1955 .
Career at Los Alamos
In 1952, Menzel joined the theoretical division at Los Alamos, becoming one of the first programmers on the MANIAC computer . Her work spanned both applied physics and fundamental research. She is best known for programming the Fermi–Pasta–Ulam–Tsingou (FPUT) problem, a landmark 1953–1955 computer simulation initiated by Enrico Fermi, John Pasta, and Stanisław Ulam .
The FPUT experiment studied the relaxation of energy in a model crystal and became a foundational case in nonlinear science and chaos theory. Menzel’s algorithm and execution of the simulation were pivotal in revealing unexpected recurrence patterns, influencing later developments in soliton theory and computational physics . She also contributed to early computer graphics and Fortran programming .
Personal Life
Menzel married Joseph L. Menzel in 1958; they were together for 63 years . She had two daughters, both medical doctors, and was active in community life after retirement, enjoying daily swims, library walks, and local social groups .
Legacy
Her contributions were formally recognized in 2008 when the problem was renamed the Fermi–Pasta–Ulam–Tsingou problem . A 2026 Communications in Physics commentary traced modern particle-based simulations back to her 1953 code .
Death and Memorial
Mary Menzel died peacefully at her Los Alamos home on August 27, 2026, at age 97 . A memorial service was held September 21, 2026, at Rivera Family Funeral Home in Espanola, NM, followed by a private burial at Santa Fe National Cemetery . Memorial donations were suggested to the Betty Ehart Senior Center in Los Alamos .
In summary: Mary Tsingou Menzel was a trailblazing scientist whose programming work on the FPUT problem helped shape modern computational physics, chaos theory, and nonlinear dynamics, and whose career at Los Alamos bridged early computing and fundamental research.
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Mathematician Who Waited 50 Years for Proper Credit for Her Work Has Died - The New York Times
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