John Clive Ward was perhaps one of the most brilliant British physicists
of the post war era. A contributor to the *Standard Model* and the
creator of the famed *Ward Identities* his contributions are
discussed in several well-known
books dealing with theoretical and particle physics.

The *Ward Identities* have their origin in a 1950 paper published in *Physical Review*. This was a succinct master piece authored by J. C. Ward and entitled *An identity in quantum electrodynamics*. Building on previous work by Dyson this elegant letter proved in seven steps one of the most important and celebrated results of renormalization theory. In a following paper, published in 1951, Ward extended the initial result to a set of identities. Today, the *Ward Identity* or *Ward Identities*, are standard teachings in theoretical physics and continue to be the focus of considerable research activity. Some four thousand journal physics papers have been published with *Ward Identity* or *Ward Identities* either in their titles or abstracts. A much larger number of web sites refer to this subject.

In addition to his profound influence in field theory, and quantum electrodynamics, he
made significant and fundamental contributions to quantum mechanics,
elementary particle physics, quantum solid-state physics,
and quantum statistics. However, his contributions have not yet received the widespread recognition they deserve. It has been
said that for decades physicists have made use of his principles and
developments *"often without knowing it, and generally without quoting
him."*

Born in London, the 1st of August of 1924, John Ward was educated at Oxford. His doctoral advisor was M. H. L. Pryce who, like P. A. M. Dirac, was a student of R. H. Fowler. Following a series of appointments John Ward arrived to Australia in 1967, via
Princeton and Johns Hopkins, and played a major role in creating a
high-class physics program at Macquarie
University . This physics curriculum was based on the now famous
*Feynman Lectures on Physics* and included a superb experimental
physics program. Under his influence, and with the assistance of several colleagues (including R. A. Aitchison, C. E. Curnow, E. Laisk, and R. E. B. Makinson), the foundations of a Macquarie
physics education became a combination of courses in electromagnetism,
quantum physics, solid state physics, advanced electronics, and experimental physics in addition to courses in applied
mathematics. At
Macquarie he became known for his forceful defense of science,
high academic standards, and for his uncompromising honesty. In this regard, he openly supported the student movement that permanently changed the degree structure of the university. This innovation strengthened significantly the sciences at Macquarie.

Although himself a gifted theoretician John Ward always held a deep rooted respect for experimental physics and engineering. This well balanced and utilitarian philosophy was well reflected in the nature of the Macquarie physics degree.

John Ward was a Fellow of The Royal Society and received several prestigious awards including the Heinaman Prize, the Hughes Medal, and the Guthrie Medal. His contributions
to theoretical physics inspired admiration among his
most illustrious peers. In this regard, Sakharov classified him as one of the *titans* of quantum electrodynamics alongside Dyson, Feynman, Schwinger, and Tomonaga. In 1988 one of his former students met Julian
Schwinger at a conference reception in Lake Tahoe. Once Schwinger knew that the young physicist
was from Macquarie, he smiled and immediately proceeded to focus the conversation
on one topic alone: John Ward.

In an informative and interesting magazine article he was described as a *"restrained rather distant Englishman."* Distance apart, he was the epitome of a physicist and a scholar,a man who exerted a distinct influence in the education of those physicists who knew him. An accomplished pianist, and french horn player, he spent the last years of his life in
Vancouver Island, Canada. During this period, his time was devoted to his physics, wine making, and
traveling to places like Europe, Mexico, and the south of South America.

I had the privilege of sharing the last couple of days of 1999 and the first day of 2000, with John, in Santiago de Chile, at the foot of the majestic Andes. We discussed a litany of topics from physics to geopolitics. We laughed, tasted some wine, and celebrated our achievement at Macquarie. He was looking forward to get back to work on his physics and he suggested teaching jointly a refreshing physics course, for high school teachers in Santiago, similar to a course he had taught at Macquarie. However, it would not be God's will. John died following a trip to the South Pacific the 6th of May of 2000.

- F. J. Duarte and M. Brandt, "Science notes,"
*Arena*12(6), 7 (1979). - F. J. Duarte and M. Brandt, "Science notes,"
*Arena*12(7), 5 (1979). - G. Sheridan, "Australian physicist wins Guthrie Medal,"
*The Bulletin*101(5239), 49-50 (1980). - G. Hooft, "Gauge theories of the forces between elementary particles,"
*Sci. Amer.*242, 104-138 (1980). - A. Sakharov,
*Memoirs*(Knopf, New York, 1990). - P. W. Anderson, "Is complexity physics?,"
*Physics Today*44 (7), 9-11 (1991). - N. Dombey and E. Grove, "Britain's thermonuclear bluff,"
*The London Review of Books*, 22nd of October, 1992. - M. Dunhill, Oxford note on the Hilary Term 1995.
- R. Delbourgo, "The Nobel prize in physics 1999,"
*The Physicist*36, 215-219 (1999).

- R. Delbourgo,
"John Clive Ward 1924-2000,"
*CERN Courier*40 (6) (2000). - F. J. Duarte and J. A. Piper, "John Clive Ward, FRS,"
*The Physicist*37 (4), 145-146 (2000). - F. J. Duarte, "J. C. Ward: elegant physics and a practical perspective,"
*Optics and Photonics News*11 (8), 62-63 (2000).^{*} - R. H. Dalitz and
F. J. Duarte, "John Clive Ward,"
*Physics Today*53 (10), 99-100 (2000). - F. J. Duarte, "The man behind an identity in quantum electrodynamics,"
*Australian Physics*46 (6), 171-175 (2009).

Note 1: a biographical note on Australian Physicist Richard ("Dick") H. Dalitz, a long time friend of John C. Ward, is available from Physics at Oxford. A more extensive article including a listing of Dalitz's works is entitled "The scientific heritage of Richard Henry Dalitz, FRS (1925-2006)" (by I. J. R. Aitchison *et al.*).

Note 2: in a long series of conversations with Dick Dalitz, whilst preparing the article on John Ward for *Physics Today*, it became clear to me that Dick was convinced tha John's contribution to the Standard Model was more extensive than accepted by conventional wisdom. Dick also accepted John's relevance to Britain's H-Bomb efforts. This was made explicit in his contribution to the *Physics Today* article. Further, Dick was working on a book on John's papers and contributions to physics which was the focus of my last conversation with him (Frank Duarte).

Note 3: an article describing a little known idea of John Ward, in the isotope separation field, known in Australia as the *Ward Process* is described in:

- A. W. Pryor, "Personal memories of two advanced uranium enrichment projects at Lucas Heights in the years 1972-1980,"
*The Australian & New Zealand Physicist*33 (3-4), 53-58 (1997).

- M. H. L. Pryce and J. C. Ward, "Angular correlation effects with
annhilation radiation,"
*Nature*160, 435 (1947). - J. C. Ward, "The scattering of light by light,"
*Phys. Rev.*77, 293 (1950). - J. C. Ward, "An identity in quantum electrodynamics,"
*Phys. Rev.*78, 182 (1950). - J. C. Ward, "A convergent non-linear field theory,"
*Phys. Rev.*79, 406 (1950). - J. C. Ward, "Quantum effects in the interaction of electrons with high frequency fields,"
*Phys. Rev.*80, 119 - 119 (1950). - J. C. Ward, "Renormalization theory of the interaction of nucleons,
mesons, and photons,"
*Phys. Rev.*84, 897-901 (1951). - J. C. Ward and J. Wilks, "The velocity of second sound in liquid
helium near the absolute zero,"
*Phil. Mag.*42, 314-316 (1951). - J. C. Ward and J. Wilks, "Second sound and the thermo-mechanical
effect,"
*Phil. Mag.*43, 48-50 (1952). - M. Kac and J. C. Ward, "A combinatorial solution of the two-
dimensional Ising model,"
*Phys. Rev.*88, 1332-1337 (1952). - R. B. Potts and J. C. Ward, "The combinatrial method and the two-dimensional ising model,"
*Prog. Theor. Phys.*13, 38-46 (1955). - A. Salam and J. C. Ward, "Weak and electromagnetic interactions,"
*Nuovo Cimento*11, 568-577 (1959). - E. W. Montroll and J. C. Ward, "Quantum statistics of interacting particles; general theory and some remarks on properties of an electron gas,"
*Phys. Fluids*1, 55-72 (1958). - J. M. Luttinger and J. C. Ward, "Ground-state energy and many-
fermion system,"
*Phys. Rev.*118, 1417-1427 (1960). - A. Salam and J. C. Ward, "Δl = ½ rule,"
*Phys. Rev. Lett.*5, 390 (1960). - A. Salam and J. C. Ward, "On a gauge theory of elementary interactions,"
*Nuovo Cimento*19, 166-170 (1961). - E. W. Montroll, R. B. Potts, and J. C. Ward, "Correlations and
spontaneous magnetization of the two-dimensionaol Ising model,"
*J. Math. Phys.*4, 308-322 (1963). - A. Salam and J. C. Ward, "Electromagnetic and weak interactions,"
*Phys. Lett.*13, 168-171 (1964). - A. Salam and J. C. Ward, "Gauge theory of elementary interactions,"
*Phys. Rev.*136 B, 763-768 (1964). - J. C. Ward, "General relativity, the Dirac equation, and higher symmetries,"
*Proc. Natl. Acad. Sci. USA*75, 2568 (1978).

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Page first published on the *13th of May, 2000.* Updated on the *20th of April, 2013.*