Arthur Conor Joseph Cox, solicitor and senator, is born on July 25, 1891, in Dublin.

Cox is the younger of two sons of Dr. Michael Cox, physician originally of Roscommon and Sligo, and Elizabeth Cox (née Nolan). Like his father, he supports the Irish Parliamentary Party (IPP) and maintains an interest in a wide range of subjects outside his chosen career throughout his life. He attends Belvedere College (1900-09), where he often obtains first place in his class and wins the Union prize for essay writing three years in a row (1905–07). He is the first auditor of the Belvedere Debating Society and is succeeded in the post by George O’Brien, who remains his lifelong friend. In 1909, he wins both a Royal University of Ireland (RUI) scholarship and an entrance exhibition to University College Dublin (UCD), a college of the new National University of Ireland (NUI).

Working for an arts degree at UCD, then housed at 86 St. Stephen’s Green, Cox overcomes an innate shyness to cultivate a reputation as a skillful and humorous orator in the Literary and Historical Society (L&H), where he befriends both Kevin O’Higgins and John A. Costello. He has immense respect for both men, and they remain firm friends. The respect is reciprocal, and during their subsequent careers O’Higgins and Costello often have occasion to seek Cox’s wise counsel. In 1912, Cox defeats Costello for the auditorship of the L&H by 112 votes to 63, and in the same year attains a first-class honours BA. His role as auditor means that he is involved with UCD for a further year. He attends lectures at the Incorporated Law Society while at the same time he pursues both the LL. B course, a one-year postgraduate law degree, and an MA at UCD. By the end of 1913 he has achieved first place in the LL. B and first-class honours in his MA. In addition, he has become auditor of the Solicitors’ Apprentices’ Debating Society.

After university Cox is apprenticed to a solicitor, Francis Joseph Scallan, who runs a firm in partnership with his brother, John Louis Scallan. On qualifying in 1915, he remains with the firm as an assistant solicitor until 1920, when he forms a partnership with another solicitor, John McAreavey. The firm is called Arthur Cox & Co. and has its offices at 5 St. Stephen’s Green. Initially the new firm’s clients are predominantly made up of those for whom he worked at his previous firm, and friends from his university days. Through George O’Brien he meets Sir Horace Plunkett, president of the Irish Agricultural Organisation Society (IAOS), a connection of enormous benefit, which sees the firm both become solicitor to the IAOS and gain a large number of clients through its membership.

Despite his relative youth, Cox is held in high esteem by those attempting to construct the apparatus of the newly independent Irish Free State in 1922. This is clear when he provides Hugh Kennedy, law officer to the provisional government and future Chief Justice of Ireland, with a lengthy opinion on the status of the Anglo–Irish Treaty, in the context of drafting a constitution for the new state. He is conscious of the need to counter claims that the treaty does not go far enough in acknowledging Irish nationhood; and he advises that the first article of the new constitution should explicitly state that the sovereignty of the new state derives from the Irish people. This is ultimately done in the preamble of the Constitution of the Irish Free State (1922).

In 1923, Cox is appointed solicitor to Siemens-Schuckert, the German engineering firm, and helps to negotiate the terms of an agreement with the Irish government for the construction of a hydro-electric station at Ardnacrusha, County Clare. In 1926, the Electricity (Supply) Act is passed, on which he advises. Although he experiences much success in these years, he is very much affected by the death of his friend Kevin O’Higgins, who is shot and dies from his injuries on July 10, 1927. He visits O’Higgins on his deathbed. Arthur Cox & Co. expands rapidly in its early years, and in 1926 Cox and McAreavey purchase new premises at 42–3 St. Stephen’s Green. Four years later he buys his partner out of the firm.

Given his friendships with various members of the original Free State administration, and the amount of work he receives from it, government work for Cox dries up when Fianna Fáil comes to power in 1932. However, the protectionist corporate policies and implementing legislation of the new administration bring new opportunities. The legislation places severe restrictions on foreign companies owning and operating enterprises in Ireland. He develops a reputation for assisting corporate clients to circumnavigate the restrictive laws. Along with his friend James Beddy, chief executive of the Industrial Credit Corporation, he realises that foreign investment is essential to the growth of the Irish economy. He introduces many clients to Beddy, and between them they find ways to assist the firms in investing in various enterprises without breaching the law. During this period, he cements his reputation as the foremost corporate lawyer in Ireland. This is evident when James Marmion Gilmor Carroll appoints him, as one of only two non-family members, to the board of the tobacco manufacturers P. J. Carroll & Co. He plays a key role in transforming the archaic practices of the firm by persuading Carroll to recruit Kevin McCourt as executive director. He and McCourt later convince Carroll to employ his nephew, Don Carroll, who plays a key role in the modernisation and diversification of the firm. In 1960 He and Carroll negotiate the sale of 40 per cent of the company to Rothmans International.

Despite his reputation as a corporate lawyer, Cox also represents non-corporate clients, some of whom include well-known personalities. In 1946, he agrees to assist Hungarian film-maker Gabriel Pascal in attempting to persuade the Irish government to establish an Irish film studio, with a view to filming the plays of George Bernard Shaw. He puts much time and energy into trying to convince the government to provide finance for the venture, but to no avail.

In 1942, Cox is elected to the council of the Incorporated Law Society and becomes president of the society for the 1951-52 term, presiding over the celebrations to commemorate the centenary of the society’s charter of incorporation. In 1951, he also becomes chairman of the company law reform committee, which produces its report, known as “the Cox report,” in 1958. Renowned for his eccentricities, he is almost as well known for his shabby mode of dress as he is for his incisive mind and immense capacity for work. His reputation is also based on a strict adherence to discretion and confidentiality. This is clear in 1948 when his old friend John A. Costello, having been offered the office of Taoiseach in the first inter-party government, turns to him for advice on whether he should accept the post. In 1954, Costello nominates him to the 8th Seanad.

In October 1953, the London firm of Nicholl Manisty & Co. retains him to represent British Prime Minister Sir Winston Churchill in a libel action brought by Brigadier Eric Dorman O’Gowan, arising from comments in Churchill’s The Second World War: The Hinge of Fate. Churchill also relies on the advice of his friend Sir Hartley Shawcross, leader of the English bar, who makes several visits to Dublin to meet Cox and counsel (including John A. Costello). Cox and Shawcross believe it necessary to reach some form of settlement to avoid Churchill having to appear in court. The action is therefore withdrawn in return for an undertaking that certain corrections will be made.

On August 5, 1940, Cox marries Brigid O’Higgins (née Cole), widow of his friend Kevin O’Higgins. Prior to this he lives with his mother at 26 Merrion Square. He had purchased Carraig Breac in Howth in 1936 and moves there on his marriage. His commitment to his work means that he often works seven days a week and he therefore keeps a flat on Mespil Road, Dublin, from 1940. In 1959, he sells Carraig Breac and moves to 8 Shrewsbury Road, Dublin.

On February 14, 1961, Brigid Cox dies. Soon after, Cox decides to retire from his profession and study for the priesthood. He is intent on becoming a Jesuit and discusses his intentions with the Archbishop of Dublin, John Charles McQuaid, who agrees to ordain him after two years of private tuition at the Jesuit theologate at Milltown Park, Dublin. On being accepted by the Jesuits, he makes arrangements to settle his worldly affairs by selling his home on Shrewsbury Road and leaving his practice to the existing partners. He enters Milltown Park on October 15, 1961, and is ordained on December 15, 1963. His impact on Irish life over the previous forty years is evident by the presence at his ordination of John A. Costello, W. T. Cosgrave, Seán T. O’Kelly, and James Dillon, among others.

Following ordination Cox is appointed to serve at the Jesuit mission in Monze, Northern Rhodesia (Zambia). He arrives at Monze in August 1964 and is appointed extraordinary chaplain to the local convent and hospital. On June 8, 1965, he suffers head injuries in a car accident while traveling to Namwada in Zambia. Taken to Choma hospital, he initially appears to be relatively unscathed but collapses and dies on June 11, 1965. He is found to have suffered from a cerebral haemorrhage and a fractured skull. He is buried in the grounds of the Jesuit retreat house in Chikuni, Zambia.

Many of the Cox family papers are housed at the UCD archives.

(From: “Cox, Arthur Conor Joseph” by Shaun Boylan, Dictionary of Irish Biography, http://www.dib.ie, October 2009)