Born on 11 June 1870 second son of Edmond Dundon, a wool spinner, and Ellen Daly his wife. He was educated at the North Monastery and Queen's College, Cork, in the Royal University of Ireland. Dundon practised for many years at 16 St Patrick's Place, Cork, and was surgeon to the Mercy Hospital and to the North City and County Hospital. He was for a time Professor of Materia Medica at University College, as Queen's College was renamed when the Royal University was reconstituted as the National University of Ireland in 1908. He resigned this chair on his appointment as Professor of Surgery, and retired in 1940. He examined for the Irish Conjoint board, and was a member of the Irish medical registration council. Dundon married in 1910 May McDonnell. He died at Cork on 24 February 1952, aged 81, survived by two sons and three daughters. His son Charles Dundon is a Fellow of the College; his elder son John Conor Dundon is a Fellow of the Edinburgh college; both practise surgery at Cork. One daughter is also a doctor at Cork.