William O'Brien was a Fine Gael

Fine Gael

Fine Gael is a centre-right to centrist political party in the Republic of Ireland. It is the single largest party in Ireland in the Oireachtas, in local government, and in terms of Members of the European Parliament. The party has a membership of over 35,000...

 politician from County Limerick

County Limerick

It is thought that humans had established themselves in the Lough Gur area of the county as early as 3000 BC, while megalithic remains found at Duntryleague date back further to 3500 BC...

 in Ireland

Republic of Ireland

Ireland , described as the Republic of Ireland , is a sovereign state in Europe occupying approximately five-sixths of the island of the same name. Its capital is Dublin. Ireland, which had a population of 4.58 million in 2011, is a constitutional republic governed as a parliamentary democracy,...

. He was a senator

Seanad Éireann

Seanad Éireann is the upper house of the Oireachtas , which also comprises the President of Ireland and Dáil Éireann . It is commonly called the Seanad or Senate and its members Senators or Seanadóirí . Unlike Dáil Éireann, it is not directly elected but consists of a mixture of members chosen by...

 from 1969 to 1977, and then a Teachta Dála

Teachta Dála

A Teachta Dála , usually abbreviated as TD in English, is a member of Dáil Éireann, the lower house of the Oireachtas . It is the equivalent of terms such as "Member of Parliament" or "deputy" used in other states. The official translation of the term is "Deputy to the Dáil", though a more literal...

 (TD) for Limerick West from 1977 to 1987.

Before entering politics, O'Brien was an employee of Córas Iompair Éireann

Córas Iompair Éireann

Córas Iompair Éireann , or CIÉ, is a statutory corporation of the Irish state, answerable to the Irish Government and responsible for most public transport in the Republic of Ireland and, jointly with its Northern Ireland counterpart, the Northern Ireland Transport Holding Company, between the...

 (CIÉ), the state-run Irish transport company.

He stood unsuccessfully as a Fine Gael candidate for Dáil Éireann

Dáil Éireann

Dáil Éireann is the lower house, but principal chamber, of the Oireachtas , which also includes the President of Ireland and Seanad Éireann . It is directly elected at least once in every five years under the system of proportional representation by means of the single transferable vote...

 in the Limerick West constituency at the 1969

Irish general election, 1969

The Irish general election of 1969 was held on 18 June 1969. The newly elected members of the 19th Dáil assembled at Leinster House on 2 July when the new Taoiseach and government were appointed...

 and 1973 general elections

Irish general election, 1973

The Irish general election of 1973 was held on 28 February 1973. The newly elected 144 members of the 20th Dáil assembled at Leinster House on 4 March when the new Taoiseach and government were appointed....

 before winning the seat at the 1977 general election

Irish general election, 1977

The Irish general election of 1977 was held on 16 June 1977 and is regarded as a pivotal point in twentieth century Irish politics. The general election took place in 42 parliamentary constituencies throughout Ireland for 148 seats in the lower house of parliament, Dáil Éireann. The number of...

. After his 1969 defeat, he was elected to the 12th Seanad Éireann on the Labour Panel, which returned him in 1973 to the 13th Seanad.

Once in the Dáil, O'Brien was re-elected in 1981

Irish general election, 1981

The Irish general election of 1981 was held on 11 June 1981, three weeks after the dissolution of the Dáil on 21 May. The newly elected 166 members of the 22nd Dáil assembled at Leinster House on 30 June when a new Taoiseach and government were appointed....

 and at both the February 1982 and November 1982 elections. He did not contest the 1987 general election

Irish general election, 1987

The Irish general election of 1987 was held on 17 February 1987, four weeks after the dissolution of the Dáil on 20 January. The newly-elected 166 members of the 25th Dáil assembled at Leinster House on 10 March when a new Taoiseach and government were appointed.The general election took place in...

, and retired from politics.