Anthony James Leggett
Encyclopedia
Sir Anthony James Leggett, KBE
Order of the British Empire
The Most Excellent Order of the British Empire is an order of chivalry established on 4 June 1917 by George V of the United Kingdom. The Order comprises five classes in civil and military divisions...

, FRS
Royal Society
The Royal Society of London for Improving Natural Knowledge, known simply as the Royal Society, is a learned society for science, and is possibly the oldest such society in existence. Founded in November 1660, it was granted a Royal Charter by King Charles II as the "Royal Society of London"...

 (born 26 March 1938, Camberwell
Camberwell
Camberwell is a district of south London, England, and forms part of the London Borough of Southwark. It is a built-up inner city district located southeast of Charing Cross. To the west it has a boundary with the London Borough of Lambeth.-Toponymy:...

, London
London
London is the capital city of :England and the :United Kingdom, the largest metropolitan area in the United Kingdom, and the largest urban zone in the European Union by most measures. Located on the River Thames, London has been a major settlement for two millennia, its history going back to its...

, UK), aka Tony Leggett, has been a Professor
Professor
A professor is a scholarly teacher; the precise meaning of the term varies by country. Literally, professor derives from Latin as a "person who professes" being usually an expert in arts or sciences; a teacher of high rank...

 of Physics
Physics
Physics is a natural science that involves the study of matter and its motion through spacetime, along with related concepts such as energy and force. More broadly, it is the general analysis of nature, conducted in order to understand how the universe behaves.Physics is one of the oldest academic...

 at the University of Illinois at Urbana-Champaign
University of Illinois at Urbana-Champaign
The University of Illinois at Urbana–Champaign is a large public research-intensive university in the state of Illinois, United States. It is the flagship campus of the University of Illinois system...

 since 1983.

Professor Leggett is widely recognized as a world leader in the theory of low-temperature physics
Cryogenics
In physics, cryogenics is the study of the production of very low temperature and the behavior of materials at those temperatures. A person who studies elements under extremely cold temperature is called a cryogenicist. Rather than the relative temperature scales of Celsius and Fahrenheit,...

, and his pioneering work on superfluid
Superfluid
Superfluidity is a state of matter in which the matter behaves like a fluid without viscosity and with extremely high thermal conductivity. The substance, which appears to be a normal liquid, will flow without friction past any surface, which allows it to continue to circulate over obstructions and...

ity was recognized by the 2003 Nobel Prize in Physics
Nobel Prize in Physics
The Nobel Prize in Physics is awarded once a year by the Royal Swedish Academy of Sciences. It is one of the five Nobel Prizes established by the will of Alfred Nobel in 1895 and awarded since 1901; the others are the Nobel Prize in Chemistry, Nobel Prize in Literature, Nobel Peace Prize, and...

. He has shaped the theoretical understanding of normal and superfluid helium liquids and strongly coupled superfluids. He set directions for research in the quantum physics of macroscopic dissipative system
Dissipative system
A dissipative system is a thermodynamically open system which is operating out of, and often far from, thermodynamic equilibrium in an environment with which it exchanges energy and matter....

s and use of condensed systems to test the foundations of quantum mechanics
Quantum mechanics
Quantum mechanics, also known as quantum physics or quantum theory, is a branch of physics providing a mathematical description of much of the dual particle-like and wave-like behavior and interactions of energy and matter. It departs from classical mechanics primarily at the atomic and subatomic...

.

Early life

He was born in Camberwell
Camberwell
Camberwell is a district of south London, England, and forms part of the London Borough of Southwark. It is a built-up inner city district located southeast of Charing Cross. To the west it has a boundary with the London Borough of Lambeth.-Toponymy:...

, South London. His father's forebears were village cobblers in a small village in Hampshire, though his father broke with this tradition to become a greengrocer
Greengrocer
A greengrocer or fruiterer is a retail trader in fruit and vegetables; that is, in green groceries. Greengrocer is primarily a British and Australian term, and greengrocers' shops were once common in suburbs, towns and villages...

; his father would relate how he used to ride with him to buy vegetables at the Covent Garden
Covent Garden
Covent Garden is a district in London on the eastern fringes of the West End, between St. Martin's Lane and Drury Lane. It is associated with the former fruit and vegetable market in the central square, now a popular shopping and tourist site, and the Royal Opera House, which is also known as...

 market in London. His mother's parents were of Irish descent; her father had emigrated to England
England
England is a country that is part of the United Kingdom. It shares land borders with Scotland to the north and Wales to the west; the Irish Sea is to the north west, the Celtic Sea to the south west, with the North Sea to the east and the English Channel to the south separating it from continental...

 and worked as a clerk in the naval dockyard in Chatham
Chatham Dockyard
Chatham Dockyard, located on the River Medway and of which two-thirds is in Gillingham and one third in Chatham, Kent, England, came into existence at the time when, following the Reformation, relations with the Catholic countries of Europe had worsened, leading to a requirement for additional...

 . His maternal grandmother, who survived into her eighties, was sent out to domestic service at the age of twelve, she eventually married his grandfather and raised a large family, then in her late sixties emigrated to Australia
Australia
Australia , officially the Commonwealth of Australia, is a country in the Southern Hemisphere comprising the mainland of the Australian continent, the island of Tasmania, and numerous smaller islands in the Indian and Pacific Oceans. It is the world's sixth-largest country by total area...

 to join her daughter and son-in-law, and finally returned to the UK for her last years.

His father and mother were each the first in their families to receive a university education; they met and became engaged while students at the Institute of Education at the University of London
University of London
-20th century:Shortly after 6 Burlington Gardens was vacated, the University went through a period of rapid expansion. Bedford College, Royal Holloway and the London School of Economics all joined in 1900, Regent's Park College, which had affiliated in 1841 became an official divinity school of the...

, but were unable to get married for some years because his father had to care for his own mother and siblings. His father worked as a secondary school
Secondary school
Secondary school is a term used to describe an educational institution where the final stage of schooling, known as secondary education and usually compulsory up to a specified age, takes place...

 teacher of physics
Physics
Physics is a natural science that involves the study of matter and its motion through spacetime, along with related concepts such as energy and force. More broadly, it is the general analysis of nature, conducted in order to understand how the universe behaves.Physics is one of the oldest academic...

,
chemistry
Chemistry
Chemistry is the science of matter, especially its chemical reactions, but also its composition, structure and properties. Chemistry is concerned with atoms and their interactions with other atoms, and particularly with the properties of chemical bonds....

 and mathematics
Mathematics
Mathematics is the study of quantity, space, structure, and change. Mathematicians seek out patterns and formulate new conjectures. Mathematicians resolve the truth or falsity of conjectures by mathematical proofs, which are arguments sufficient to convince other mathematicians of their validity...

. His mother also taught secondary school mathematics for a time, but had to give this up when he was born. He was eventually followed by two sisters, Clare and Judith, and two brothers, Terence and Paul. Their parents were both Roman Catholics, so the siblings were all brought up in that faith. He ceased to be a practicing Catholic
Catholic
The word catholic comes from the Greek phrase , meaning "on the whole," "according to the whole" or "in general", and is a combination of the Greek words meaning "about" and meaning "whole"...

 in his early twenties.

Soon after he was born, his parents bought a house in Upper Norwood
Upper Norwood
Upper Norwood is an elevated area in south London, England within the postcode SE19. It is a residential district largely in the London Borough of Croydon although some parts extend into the London Borough of Lambeth, London Borough of Southwark and the London Borough of Bromley. Upper Norwood...

, south London. However, when he was 18 months old, WWII broke out and he was evacuated to Englefield Green
Englefield Green
Englefield Green is a large village in northern Surrey, England. It is home to Royal Holloway, University of London, the south eastern corner of Windsor Great Park and close to the towns of Egham, Windsor, Staines and Virginia Water...

, a small village in Surrey
Surrey
Surrey is a county in the South East of England and is one of the Home Counties. The county borders Greater London, Kent, East Sussex, West Sussex, Hampshire and Berkshire. The historic county town is Guildford. Surrey County Council sits at Kingston upon Thames, although this has been part of...

 on the edge of the great park of Windsor Castle
Windsor Castle
Windsor Castle is a medieval castle and royal residence in Windsor in the English county of Berkshire, notable for its long association with the British royal family and its architecture. The original castle was built after the Norman invasion by William the Conqueror. Since the time of Henry I it...

, where he stayed for the duration of the war. After the end of the war, he returned to the Upper Norwood house and lived there until 1950; his father taught at a school in north-east London and his mother looked after the five children full time. He attended the local Catholic primary school, and later, following a successful performance in the "eleven plus
Eleven plus
In the United Kingdom, the 11-plus or Eleven plus is an examination administered to some students in their last year of primary education, governing admission to various types of secondary school. The name derives from the age group for secondary entry: 11–12 years...

" examination which he took rather earlier than most, and then transferred to Wimbledon College
Wimbledon College
Wimbledon College is a government-maintained voluntary-aided Jesuit Roman Catholic high school for boys aged 11 to 19. The school is based at Edge Hill, Wimbledon, London. It was founded in 1892 "for improvement in living and learning to the greater glory of God and the common good"...

.

Education

He won a scholarship to Balliol College, Oxford
Balliol College, Oxford
Balliol College , founded in 1263, is one of the constituent colleges of the University of Oxford in England but founded by a family with strong Scottish connections....

, in December 1954 and entered the University the following year with the intention of reading the degree technically known as Literae Humaniores
Literae Humaniores
Literae Humaniores is the name given to an undergraduate course focused on Classics at Oxford and some other universities.The Latin name means literally "more humane letters", but is perhaps better rendered as "Advanced Studies", since humaniores has the sense of "more refined" or "more learned",...

 (classics).

He completed a second undergraduate degree, this time in physics at Merton College. One person who was willing to overlook his unorthodox credentials was Dirk ter Haar
Dirk ter Haar
Dirk ter Haar was an Anglo-Dutch physicist.Dirk ter Haar studied physics at Leiden University, was research fellow of Niels Bohr in Copenhagen, and received his Ph.D. in Leiden from Hendrik Kramers for a dissertation on the origin of the solar system...

, then a reader in theoretical physics and a fellow of Magdalen College, Oxford
Magdalen College, Oxford
Magdalen College is one of the constituent colleges of the University of Oxford in England. As of 2006 the college had an estimated financial endowment of £153 million. Magdalen is currently top of the Norrington Table after over half of its 2010 finalists received first-class degrees, a record...

; so he signed up for research under his supervision. As with all ter Haar's students in that period, the tentatively assigned thesis topic was "Some Problems in the Theory of Many-Body Systems", which left a considerable degree of latitude.

Dirk took a great interest in the personal welfare of his students and their families, and was meticulous in making sure they received adequate support; indeed, he encouraged Leggett to apply for a Prize Fellowship at Magdalen, which he held from 1963 to 1967. In the end Leggett's thesis consisted of studies of two somewhat disconnected problems in the general area of liquid helium
Helium
Helium is the chemical element with atomic number 2 and an atomic weight of 4.002602, which is represented by the symbol He. It is a colorless, odorless, tasteless, non-toxic, inert, monatomic gas that heads the noble gas group in the periodic table...

, one on higher-order phonon
Phonon
In physics, a phonon is a collective excitation in a periodic, elastic arrangement of atoms or molecules in condensed matter, such as solids and some liquids...

 interaction processes in superfluid
Superfluid
Superfluidity is a state of matter in which the matter behaves like a fluid without viscosity and with extremely high thermal conductivity. The substance, which appears to be a normal liquid, will flow without friction past any surface, which allows it to continue to circulate over obstructions and...

 4He and the other on the properties of dilute solutions of 4He in normal liquid 3He (a system which unfortunately turned out to be much less experimentally accessible than the other side of the phase diagram, dilute solutions of 3He in 4He). Oxford University
University of Oxford
The University of Oxford is a university located in Oxford, United Kingdom. It is the second-oldest surviving university in the world and the oldest in the English-speaking world. Although its exact date of foundation is unclear, there is evidence of teaching as far back as 1096...

 awarded Leggett an Honorary DLitt
Honorary degree
An honorary degree or a degree honoris causa is an academic degree for which a university has waived the usual requirements, such as matriculation, residence, study, and the passing of examinations...

 in June 2005.

Career

Leggett spent the period August 1964 - August 1965 as a postdoctoral fellow at the University of Illinois at Urbana-Champaign
University of Illinois at Urbana-Champaign
The University of Illinois at Urbana–Champaign is a large public research-intensive university in the state of Illinois, United States. It is the flagship campus of the University of Illinois system...

 (UIUC), and David Pines
David Pines
David Pines is the Founding Director of the Institute for Complex Adaptive Matter and the International Institute for Complex Adaptive Matter , Distinguished Professor of Physics, UC Davis, Research Professor of Physics and Professor...

 and his colleagues (John Bardeen
John Bardeen
John Bardeen was an American physicist and electrical engineer, the only person to have won the Nobel Prize in Physics twice: first in 1956 with William Shockley and Walter Brattain for the invention of the transistor; and again in 1972 with Leon Neil Cooper and John Robert Schrieffer for a...

, Gordon Baym
Gordon Baym
Gordon Alan Baym is an American theoretical physicist.Born in New York City, he graduated from the Brooklyn Technical High School, and received his undergraduate degree from Cornell University in 1956. He earned his Ph.D...

, Leo Kadanoff
Leo Kadanoff
Leo Philip Kadanoff is an American physicist. He is a professor of physics at the University of Chicago and a former President of the American Physical Society . He has contributed to the fields of statistical physics, chaos theory, and theoretical condensed matter physics.-Biography:Kadanoff...

 and others) provided a fertile environment.
He then spent a year in the group of Professor Takeo Matsubara at Kyoto University
Kyoto University
, or is a national university located in Kyoto, Japan. It is the second oldest Japanese university, and formerly one of Japan's Imperial Universities.- History :...

 in Japan.

After one more postdoctoral year which he spent in "roving" mode, spending time at Oxford, Harvard and Illinois, in the autumn of 1967 he took up a lectureship at the University of Sussex
University of Sussex
The University of Sussex is an English public research university situated next to the East Sussex village of Falmer, within the city of Brighton and Hove. The University received its Royal Charter in August 1961....

, where he was to spend the next fifteen years of his career.

In the spring of 1982 he accepted an offer from the University of Illinois at Urbana-Champaign
University of Illinois at Urbana-Champaign
The University of Illinois at Urbana–Champaign is a large public research-intensive university in the state of Illinois, United States. It is the flagship campus of the University of Illinois system...

 (UIUC) of the MacArthur Chair with which the university had recently been endowed. As he had already committed himself to an eight-month stay at Cornell in early 1983, he finally arrived in Urbana in the early fall of that year, and has been there ever since.

Leggett's own research interests shifted away from superfluid 3He since around 1980; he worked inter alia on the low-temperature properties of glasses, high-temperature superconductivity, the [Bose-Einstein Condensate] (BEC) atomic gases and above all on the theory of experiments to test whether the formation of quantum mechanics will continue to describe the physical world as we push it up from the atomic level towards that of everyday life.

In 2007 he accepted a position at the University of Waterloo
University of Waterloo
The University of Waterloo is a comprehensive public university in the city of Waterloo, Ontario, Canada. The school was founded in 1957 by Drs. Gerry Hagey and Ira G. Needles, and has since grown to an institution of more than 30,000 students, faculty, and staff...

 Canada. For the next five years, he will spend at least two months a year on campus at the Institute for Quantum Computing
Institute for Quantum Computing
The Institute for Quantum Computing, or IQC, located in Waterloo, Canada, is an affiliate research institute of the University of Waterloo with a multidisciplinary approach to the field of quantum information processing.-IQC's Mission:...

.

He currently serves as the chief scientist at the Institute for Condensed Matter Theory
Institute for Condensed Matter Theory
The Institute for Condensed Matter Theory is an institute for the research of condensed matter theory hosted by and located at the University of Illinois at Urbana-Champaign....

, a research institute hosted by the University of Illinois at Urbana-Champaign.

Family

In the summer of 1972 he became engaged to Haruko Kinase, at that time an undergraduate student at Sussex, and they married in June 1972. In 1978, they had a daughter Asako. His wife Haruko earned a Ph.D. in cultural anthropology from the University of Illinois at Urbana-Champaign
University of Illinois at Urbana-Champaign
The University of Illinois at Urbana–Champaign is a large public research-intensive university in the state of Illinois, United States. It is the flagship campus of the University of Illinois system...

 and is currently doing research on the hospice system. Their daughter, Asako, also graduated from UIUC, with a joint major in geography and chemistry.

Research

His research focuses on cuprate superconductivity
Superconductivity
Superconductivity is a phenomenon of exactly zero electrical resistance occurring in certain materials below a characteristic temperature. It was discovered by Heike Kamerlingh Onnes on April 8, 1911 in Leiden. Like ferromagnetism and atomic spectral lines, superconductivity is a quantum...

, conceptual issues in the foundations of quantum mechanics
Quantum mechanics
Quantum mechanics, also known as quantum physics or quantum theory, is a branch of physics providing a mathematical description of much of the dual particle-like and wave-like behavior and interactions of energy and matter. It departs from classical mechanics primarily at the atomic and subatomic...

, superfluidity in highly degenerate atomic gases, low temperature properties of amorphous solids and topological quantum computation.

The 29 December 2005 edition of the International Herald Tribune
International Herald Tribune
The International Herald Tribune is a widely read English language international newspaper. It combines the resources of its own correspondents with those of The New York Times and is printed at 38 sites throughout the world, for sale in more than 160 countries and territories...

printed an article, "New tests of Einstein's 'spooky' reality", which referred to Leggett's Autumn 2005 debate at a conference in Berkeley, California
Berkeley, California
Berkeley is a city on the east shore of the San Francisco Bay in Northern California, United States. Its neighbors to the south are the cities of Oakland and Emeryville. To the north is the city of Albany and the unincorporated community of Kensington...

, with fellow Nobel laureate Norman Ramsey of Harvard University
Harvard University
Harvard University is a private Ivy League university located in Cambridge, Massachusetts, United States, established in 1636 by the Massachusetts legislature. Harvard is the oldest institution of higher learning in the United States and the first corporation chartered in the country...

. Both debated the worth of attempts to change quantum theory. Leggett thought attempts were justified, Ramsey opposed. Leggett believes quantum mechanics may be incomplete because of the quantum measurement problem
Measurement problem
The measurement problem in quantum mechanics is the unresolved problem of how wavefunction collapse occurs. The inability to observe this process directly has given rise to different interpretations of quantum mechanics, and poses a key set of questions that each interpretation must answer...

.

Affiliations

He is a member of the National Academy of Sciences
United States National Academy of Sciences
The National Academy of Sciences is a corporation in the United States whose members serve pro bono as "advisers to the nation on science, engineering, and medicine." As a national academy, new members of the organization are elected annually by current members, based on their distinguished and...

, the American Philosophical Society
American Philosophical Society
The American Philosophical Society, founded in 1743, and located in Philadelphia, Pa., is an eminent scholarly organization of international reputation, that promotes useful knowledge in the sciences and humanities through excellence in scholarly research, professional meetings, publications,...

, the American Academy of Arts and Sciences
American Academy of Arts and Sciences
The American Academy of Arts and Sciences is an independent policy research center that conducts multidisciplinary studies of complex and emerging problems. The Academy’s elected members are leaders in the academic disciplines, the arts, business, and public affairs.James Bowdoin, John Adams, and...

, the Russian Academy of Sciences
Russian Academy of Sciences
The Russian Academy of Sciences consists of the national academy of Russia and a network of scientific research institutes from across the Russian Federation as well as auxiliary scientific and social units like libraries, publishers and hospitals....

 (foreign member), and is a Fellow of the Royal Society
Royal Society
The Royal Society of London for Improving Natural Knowledge, known simply as the Royal Society, is a learned society for science, and is possibly the oldest such society in existence. Founded in November 1660, it was granted a Royal Charter by King Charles II as the "Royal Society of London"...

 (UK), the American Physical Society
American Physical Society
The American Physical Society is the world's second largest organization of physicists, behind the Deutsche Physikalische Gesellschaft. The Society publishes more than a dozen scientific journals, including the world renowned Physical Review and Physical Review Letters, and organizes more than 20...

, and American Institute of Physics
American Institute of Physics
The American Institute of Physics promotes science, the profession of physics, publishes physics journals, and produces publications for scientific and engineering societies. The AIP is made up of various member societies...

, and Life Fellow of the Institute of Physics
Institute of Physics
The Institute of Physics is a scientific charity devoted to increasing the practice, understanding and application of physics. It has a worldwide membership of around 40,000....

.

Honours

He was awarded the 2003 Nobel Prize in Physics (with V. L. Ginzburg
Vitaly Ginzburg
Vitaly Lazarevich Ginzburg ForMemRS was a Soviet theoretical physicist, astrophysicist, Nobel laureate, a member of the Russian Academy of Sciences and one of the fathers of Soviet hydrogen bomb...

 and A. A. Abrikosov
Alexei Alexeyevich Abrikosov
Alexei Alexeyevich Abrikosov is a Soviet and Russian theoretical physicist whose main contributions are in the field of condensed matter physics. He was awarded the Nobel Prize in Physics in 2003.- Biography :...

) for pioneering contributions to the theory of superconductors and superfluids. He is an Honorary Fellow of the Institute of Physics
Institute of Physics
The Institute of Physics is a scientific charity devoted to increasing the practice, understanding and application of physics. It has a worldwide membership of around 40,000....

 (U.K.). He was knighted (KBE
Order of the British Empire
The Most Excellent Order of the British Empire is an order of chivalry established on 4 June 1917 by George V of the United Kingdom. The Order comprises five classes in civil and military divisions...

) by Queen Elizabeth II in 2004 "for services to physics". He also won the 2002/2003 Wolf Foundation Prize for research on condensed forms of matter (with B. I. Halperin). He was also honoured with the Eugene Feenberg Memorial Medal (1999). He was also elected as the Foreign Associate of the National Academy of Sciences in 1997. He was also elected a Fellow of the Royal Society. He holds dual US/UK citizenship. He has been elected as a Foreign Fellow of the Indian National Science Academy(2011).
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