Felix Villars (; 6 January 1921 – 27 April 2002) was a

Swiss Swiss most commonly refers to: * the adjectival form of Switzerland * Swiss people Swiss may also refer to: Places * Swiss, Missouri * Swiss, North Carolina * Swiss, West Virginia * Swiss, Wisconsin Other uses * Swiss Café, an old café located ...

-born

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emeritus professor of

physics Physics is the scientific study of matter, its Elementary particle, fundamental constituents, its motion and behavior through space and time, and the related entities of energy and force. "Physical science is that department of knowledge whi ...

MIT The Massachusetts Institute of Technology (MIT) is a private research university in Cambridge, Massachusetts, United States. Established in 1861, MIT has played a significant role in the development of many areas of modern technology and sc ...

. He is best known for the

Pauli–Villars regularization __NOTOC__ In theoretical physics, Pauli–Villars regularization (P–V) is a procedure that isolates divergent terms from finite parts in loop calculations in field theory in order to renormalize the theory. Wolfgang Pauli and Felix Villars pu ...

, an important principle in

quantum field theory In theoretical physics, quantum field theory (QFT) is a theoretical framework that combines Field theory (physics), field theory and the principle of relativity with ideas behind quantum mechanics. QFT is used in particle physics to construct phy ...

Early life

Villars was born in

Biel Biel/Bienne (official bilingual wording; German language, German: ''Biel'' ; French language, French: ''Bienne'' ; Bernese German, locally ; ; ; ) is a bilingual city in the canton of Bern in Switzerland. With over 55,000 residents, it is the ...

Switzerland Switzerland, officially the Swiss Confederation, is a landlocked country located in west-central Europe. It is bordered by Italy to the south, France to the west, Germany to the north, and Austria and Liechtenstein to the east. Switzerland ...

and served in the Swiss Army during the

Second World War World War II or the Second World War (1 September 1939 – 2 September 1945) was a World war, global conflict between two coalitions: the Allies of World War II, Allies and the Axis powers. World War II by country, Nearly all of the wo ...

, working as a meteorologist. In 1945, he graduated from the

Swiss Federal Institute of Technology The Swiss Federal Institutes of Technology are two institutes of higher education in Switzerland (part of the ETH Domain): * Swiss Federal Institute of Technology in Lausanne Swiss most commonly refers to: * the adjectival form of Switzerland *Sw ...

with degrees in physics and mathematics. His undergraduate thesis earned him the Institute's Kern Medal for Excellence. The following year, Villars earned his doctorate in physics from the same institution. From 1946 to 1949, Villars worked as a research assistant at the Swiss Federal Institute. While there, he collaborated with

Wolfgang Pauli Wolfgang Ernst Pauli ( ; ; 25 April 1900 – 15 December 1958) was an Austrian theoretical physicist and a pioneer of quantum mechanics. In 1945, after having been nominated by Albert Einstein, Pauli received the Nobel Prize in Physics "for the ...

on work in quantum electrodynamics. They developed a method of dealing with mathematical singularities in quantum field theory, in order to extract finite physical results. This method, Pauli–Villars regularization, is used by physicists when working with field theory. In 1949, Villars married the former Jacqueline Dubois and moved to the United States. He worked for a year at the

Institute for Advanced Study The Institute for Advanced Study (IAS) is an independent center for theoretical research and intellectual inquiry located in Princeton, New Jersey. It has served as the academic home of internationally preeminent scholars, including Albert Ein ...

Princeton, New Jersey The Municipality of Princeton is a Borough (New Jersey), borough in Mercer County, New Jersey, United States. It was established on January 1, 2013, through the consolidation of the Borough of Princeton, New Jersey, Borough of Princeton and Pri ...

MIT career

In 1950, Villars was hired as a research associate at MIT and eventually became a full professor in 1959. Along with

Victor Weisskopf Victor Frederick "Viki" Weisskopf (also spelled Viktor; September 19, 1908 – April 22, 2002) was an Austrian-born American theoretical physicist. He did postdoctoral work with Werner Heisenberg, Erwin Schrödinger, Wolfgang Pauli, and Niels Boh ...

, he studied the scattering of radio waves owing to atmospheric turbulence. With

Herman Feshbach Herman Feshbach (2 February 1917 – 22 December 2000) was an American physicist. He was an Institute Professor Emeritus of physics at MIT. Feshbach is best known for Feshbach resonance and for writing, with Philip M. Morse, ''Methods of The ...

, he studied the effect of the Earth's magnetic field on the

ionosphere The ionosphere () is the ionized part of the upper atmosphere of Earth, from about to above sea level, a region that includes the thermosphere and parts of the mesosphere and exosphere. The ionosphere is ionized by solar radiation. It plays ...

. It was biology, however, that captured his imagination. Villars applied mathematical methods to studying the functioning of biological systems, yielding insights that had been missed by biologists and medical researchers who had been studying them for years. Villars was a key figure in creating the Harvard-MIT Division of Health Sciences and Technology, a collaboration between

Harvard University Harvard University is a Private university, private Ivy League research university in Cambridge, Massachusetts, United States. Founded in 1636 and named for its first benefactor, the History of the Puritans in North America, Puritan clergyma ...

and MIT. Villars was also a visiting lecturer at

Harvard Medical School Harvard Medical School (HMS) is the medical school of Harvard University and is located in the Longwood Medical and Academic Area, Longwood Medical Area in Boston, Massachusetts. Founded in 1782, HMS is the third oldest medical school in the Un ...

. With MIT physics professor George B. Benedek, he wrote a three-volume undergraduate textbook, ''Physics with Illustrative Examples from Medicine and Biology''. Villars died of cancer at his home in

Belmont, Massachusetts Belmont is a town in Middlesex County, Massachusetts, United States. It is a western suburb of Boston and is part of the Greater Boston metropolitan area. As of the 2020 U.S. census, its population was 27,295, an increase of 10.4% from 2010. H ...

on 27 April 2002. He was 81.

Books

* ; 1st edition, 1973 * *

References

External links

Obituary of Felix Villars from the MIT News Office
{{DEFAULTSORT:Villars, Felix 1921 births 2002 deaths 20th-century American physicists Swiss physicists ETH Zurich alumni People from Biel/Bienne MIT Center for Theoretical Physics faculty Swiss emigrants to the United States