John Clive Ward was 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 numerous books on quantum physics and theoretical 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. More than twenty thousand journal physics papers have been published with *Ward Identity* or *Ward Identities* either in their titles or texts.

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." In this regard, it was Ward whom, in 1947, derived the equation for the quantum entanglement of orthogonal polarizations for two particles propagating in different directions ( | x, y > - | y, x > ).

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 the School of Mathematics and Physics of Macquarie University.

Ward's physics curriculum at Macquarie 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 and vigorously supported the student science reform movement that permanently changed the degree structure of the university. This transformative innovation strengthened significantly the structure of the sciences at Macquarie and Ward considered it a "most important accomplishment."

Although himself a gifted theoretician 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.

Ward was a Fellow of The Royal Society and received several coveted physics 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 a contemporaneous magazine article (published in *The Bulletin*) 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 shared the last couple of days of 1999 and the first day of 2000, with Ward, in Santiago de Chile, at the foot of the majestic Andes. We discussed a litany of topics from physics to geopolitics. We laughed hard, tasted wine, and celebrated our iconic 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 back at Macquarie. However, it would not be. John passed away following a trip to the South Pacific on the 6th of May of 2000.

- M. H. L. Pryce and J. C. Ward, Angular correlation effects with
annhilation radiation,
*Nature*160, 435 (1947). - 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. H. Dalitz and F. J. Duarte, John Clive Ward,
*Physics Today*53 (10), 99-100 (2000). - F. J. Duarte, The origin of quantum entanglement experiments based on polarization measurements,
*The European Physical Journal H.*37, 311–318 (2012).

- 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).

- 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). - N. Dombey, John Clive Ward,
*Biogr. Mems. Fell. R. Soc.*60 (2021) .

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Copyright OSA (www.osa.org/pubs/osajournals.org).