Background
Costello was born in Geevagh, County Sligo and was educated at Summerhill College, Sligo, Street Patrick"s College, Maynooth and University College Dublin.
Costello was born in Geevagh, County Sligo and was educated at Summerhill College, Sligo, Street Patrick"s College, Maynooth and University College Dublin.
Street Patrick"s College. Summerhill College; University College Dublin.
He is a Teachta Dála (Territorial Decoration) for the Dublin Central constituency and previously served as Minister of State for Trade and Development from December 2011 to July 2014. He worked as a secondary school teacher before becoming a full-time public representative. He joined the Labour Party in 1985, and in 1989 he was elected to the 19th Seanad Éireann on the Administrative Panel.
He remained there until the 1992 general election when he was elected to Dáil Éireann.
Costello lost his seat at the 1997 general election but was subsequently elected to the Seanad again. Costello was re-elected to the Dáil at the 2002 and 2007 general elections.
On 20 December 2011, he was appointed as Minister of State for Trade and Development, a position he served in until 15 July 2014. He was dropped as a Minister of State in a reshuffle in July 2014.
He was then appointed to the Dáil Public Accounts Committee.
He lost his seat at the 2016 general election.