Field was born in Durrington, Wiltshire, England, in 1910. His parents' frequent ill health made him spend much of his childhood in orphanages and boys' homes. He moved to Australia in 1926 and worked in mines and on sheep stations.
He joined the Australian Labor Party in 1937 and became president of the Morningside branch of the party. He served in the Australian Army in New Guinea during World War II. On his discharge, he became a French polisher.
He worked for the Queensland Education Department and was elected president of the Queensland branch of the Federated Furnishing Trade Society of Australasia in the early 1970s.
On 30 June 1975, Bertie Milliner, a Queensland ALP Senator, died suddenly. It had long been a tradition that when a casual vacancy occurred in the Senate, the relevant political party would nominate the replacement to the state premier, and the state parliament would formally appoint the new senator. As was usual practice, the Labor Party nominated only one name, Mal Colston, to replace Milliner. Country Party Premier Joh Bjelke-Petersen asked for a list of three names from which he would choose the replacement; he was possibly relying on a 1962 precedent, when his predecessor, Frank Nicklin, had also required such a list of names. The Labor Party refused to provide a list and insisted on Colston being appointed.
Although Field had long Labor Party and union connections, he was certainly not an active politician and had never before sought to become one. Nevertheless, he made himself known to the Premier's office and offered his services.
Although he would be technically a Labor Senator, he vowed never to vote for the Whitlam government. Field was conservative and religious and was openly critical of what he saw as a range of "immoral" policies being advanced by Whitlam and his government. That was exactly the sort of person wanted by Bjelke-Petersen, who responded by nominating Field in the Parliament of Queensland as the new senator.
The parliament and indeed the government were far from unanimous in supporting the strange appointment, but it passed by 50 votes to 26. The appointment was formally made by the parliament on 3 September 1975. Malcolm Fraser, the federal opposition leader, had misgivings and stated publicly that Colston's name should have been accepted. However Fraser's deputy, the Country Party leader, Doug Anthony, had no such qualms.
Field was automatically expelled from the Labor Party for offering his name for Senate selection against the official ALP candidate. He took his seat in the Senate as an independent on 9 September. When he was sworn in, most Labor senators boycotted; Labor Senate leader Ken Wriedt attended but sat with his back to Field.
Field had resigned from the Education Department immediately prior to his Senate appointment, but there was a dispute about whether he remained a public servant when appointed, as the Education Act required him to give three weeks' notice. That may have made him constitutionally ineligible to be chosen as a senator so the Labor Party challenged his appointment in the High Court. (The requirement had applied to several previous appointments but had always been ignored.)
Field was thus on leave from the Senate, unable to exercise a vote, from 1 October 1975. (He had not given his maiden speech and had asked only a single question in Question Time.) Going against tradition, the opposition parties refused to provide a "pair" to maintain the relative positions of the Government and the Opposition. That gave the Coalition a majority in the Senate, allowing it to pass motions to defer consideration of supply and then force the 1975 Australian constitutional crisis.
The end of Field's Senate term came on 11 November 1975, when the parliament was dissolved in a double dissolution. He stood at the consequent 13 December election that resulted in part from his appointment but was not elected. He formed his own party in 1976, which folded three years later, and he later joined the National Party.
The controversy surrounding his and Cleaver Bunton's appointments prompted an amendment to the Constitution in 1977 to require casual Senate vacancies to be filled by a member of the same party. The appointment is still made by the State Parliament, which may choose not to fill the vacancy.
Field lived out his days in Caboolture, Queensland. He suffered from Parkinson's disease in later life, and he committed suicide by hanging in 1990. He was survived by a daughter and a stepdaughter.