Born in London in 1946 to Irish parents, Trevor Geoghegan studied at Worthing College of Art, Sussex before graduating from Chelsea School of Art, London in 1968. In 1971 he settled in Ireland, moving to Blessington, Co. Wicklow. Geoghegan lectured at the National College of Art & Design, Dublin from 1978 to 2004 and teaches annually at the Burren School of Art, Co. Clare and holds annual drawing workshops privately and at the National Gallery of Ireland.
Since turning from abstract art to New Realism, Geoghegan has had solo exhibitions with the Solomon Gallery, Dublin, the Kenny gallery, Galway and Gormleys Fine Art, Dublin. He regularly exhibits at the RHA annual exhibition and his work can be found in many collections worldwide including Aras an Uachtarain, the Arts Council of Ireland, Bank of Ireland, Dail Eireann and the National Self Portrait Collection. His work is also represented in numerous private collections in Ireland, USA, Germany, Japan, Canada and UK.