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Berni Julian Alder
Born	(1925-09-09)September 9, 1925 Duisburg, Prussia
Died	September 7, 2020(2020-09-07) (aged 94) El Cerrito, California, US
Nationality	American
Alma mater	University of California at Berkeley California Institute of Technology
Known for	Molecular dynamics simulation
Awards	Boltzmann Medal (2001) National Medal of Science (2009)
Scientific career
Fields	Statistical mechanics
Institutions	University of California at Berkeley Lawrence Livermore National Laboratory University of California at Davis
Thesis	The Radial Distribution Function and the Thermodynamic Properties of Monatomic Liquids (1952)
Doctoral advisor	John Gamble Kirkwood

Berni Julian Alder (September 9, 1925 – September 7, 2020) was a German-born American physicist specialized in statistical mechanics, and a pioneer of computational modelling of matter.

Biography

Alder was born in Duisburg, Prussia, in September 1925, to Jewish parents, a chemist and a homemaker. After the Nazis came to power, the family moved to Zurich, Switzerland. Fearing an invasion by Nazi Germany after the outbreak of World War II, the family applied for a visa to the United States, which was granted in 1941. They left by sealed train from neutral Switzerland to (formally neutral) Spain, then to Portugal, where they took a ship to the US. Following a stint in the US Navy after US entry into the war, he obtained a BSc in chemistry from the University of California at Berkeley and a master's degree in chemical engineering from the same institution in 1947. He went to the California Institute of Technology to study under John Gamble Kirkwood for his PhD in 1948 and worked for the investigation of phase transitions in hard-sphere gas with Stan Frankel, where he got the idea to use the Monte Carlo method.

After he finished at Caltech in 1952, Alder went to Berkeley and worked part-time at Berkeley to teach chemistry and part-time as a consultant under the suggestion of Edward Teller in the nuclear weapons program for the Lawrence Livermore National Laboratory to help with the equations of state. In collaboration with Thomas Everett Wainwright, and Mary Ann Mansigh, he developed techniques for molecular dynamics simulation in the mid-1950s, including the liquid-solid phase transition for hard sphere and the velocity autocorrelations function decay in liquids.

Alder, along with Teller, was one of the founders of the Department of Applied Science in 1963. He was a professor of applied science at the University of California at Davis, and later professor emeritus.

Alder died on September 7, 2020, of heart failure.

Honors

In 2001, he was awarded the Boltzmann Medal for inventing technique of molecular dynamics simulation. Alder was elected a Fellow of the American Academy of Arts and Sciences in 2008. In 2009, he was awarded the National Medal of Science. Alder was a Guggenheim Fellow. He was the editor of the book series Methods in Computational Physics and the founder of the magazine Computing.

References

1. Sleezman, Elizabeth, ed. (2004). The International Who's Who 2004. England: Europa Publications. p. 26. ISBN 1857432177.
2. ^ Berni Alder obituary
3. "Berni Alder Obituary (2020) - El Cerrito, CA - San Francisco Chronicle". Legacy.com.
4. Ceperley, David (2020-10-08). "Berni Alder (1925–2020)". Nature. 586 (7829): 356. Bibcode:2020Natur.586..356C. doi:10.1038/d41586-020-02858-5.
5. Battimelli, Giovanni; Ciccotti, Giovanni (2018). "Berni Alder and the pioneering times of molecular simulation". The European Physical Journal H. 43 (3): 303–335. doi:10.1140/epjh/e2018-90027-5. ISSN 2102-6459.
6. Ceperley, David M.; Libby, Stephen B. (2021-03-16). "Berni Julian Alder, theoretical physicist and inventor of molecular dynamics, 1925–2020". Proceedings of the National Academy of Sciences. 118 (11). doi:10.1073/pnas.2024252118. ISSN 0027-8424. PMC 7980442. PMID 33622799.
7. ^ "Interview with Berni J. Alder" (PDF). CECAM. Retrieved 10 October 2022.
8. Alder, B. J.; Wainwright, T. E. (1959-08-01). "Studies in Molecular Dynamics. I. General Method". The Journal of Chemical Physics. 31 (2): 459–466. doi:10.1063/1.1730376. ISSN 0021-9606.
9. Alder, B. J.; Wainwright, T. E. (1957-11-01). "Phase Transition for a Hard Sphere System". The Journal of Chemical Physics. 27 (5): 1208–1209. doi:10.1063/1.1743957. ISSN 0021-9606.
10. Alder, B. J.; Wainwright, T. E. (1962-07-15). "Phase Transition in Elastic Disks". Physical Review. 127 (2): 359–361. doi:10.1103/PhysRev.127.359. ISSN 0031-899X.
11. Alder, B. J.; Wainwright, T. E. (1970-01-01). "Decay of the Velocity Autocorrelation Function". Physical Review A. 1 (1): 18–21. doi:10.1103/PhysRevA.1.18. ISSN 0556-2791.
12. "UCD professor emeritus to receive National Medal of Science at White House next month". Davis Enterprise. September 22, 2009. Retrieved January 13, 2013.
13. "Book of Members, 1780-2010: Chapter A" (PDF). American Academy of Arts and Sciences. Retrieved 14 April 2011.
14. "Berni Alder receives National Medal of Science". Lawrence Livermore National Laboratory. 2009-09-18. Archived from the original on 2010-05-27. Retrieved 2010-02-12.

External links

• An Interview with Bernie Alder by George Michael, Stories of the Development of Large Scale Scientific Computing at Lawrence Livermore National Laboratory
• Berni J. Alder CECAM Prize
• Oral History interview transcript for Berni Alder on 18 June 1990, American Institute of Physics, Niels Bohr Library and Archives

• 1925 births
• 2020 deaths
• 21st-century American physicists
• American people of German-Jewish descent
• California Institute of Technology alumni
• Fellows of the American Academy of Arts and Sciences
• Fellows of the American Physical Society
• Jewish emigrants from Nazi Germany to the United States
• Lawrence Livermore National Laboratory staff
• Members of the United States National Academy of Sciences
• National Medal of Science laureates
• Scientific computing researchers
• UC Berkeley College of Chemistry alumni
• University of California, Berkeley College of Letters and Science faculty
• University of California, Davis faculty
• German emigrants to Switzerland