Education
McCarvill studied at University College Dublin (University College Dublin) and was a medical doctor, as was his son.
McCarvill studied at University College Dublin (University College Dublin) and was a medical doctor, as was his son.
He was elected as an anti-Treaty Sinn Féin Teachta Dála (Territorial Decoration) to the 3rd Dáil at the 1922 general election for the Monaghan constituency but did not take his seat because of the absentionist policy of Sinn Féin. He was re-elected at the 1923 general election and once again did not take his seat. He was elected as a Fianna Fáil Territorial Decoration at the June 1927 general election and took his seat on the 12 August 1927 along with the other Fianna Fáil TDs.
He did not contest the September 1927 general election.
His selection as candidate for the 1922 general election was controversial since the anti-Treaty side and selected McCarvill instead of Seán MacEntee, the pro-Treaty side claimed this breached the electoral pact which would have resulted in two pro-Treaty and one anti-Treaty candidates being elected without a contest, as a result of the selection of McCarvill the pro-Treaty side stood an independent candidate Thomas McHugh which forced an election, McCarvill duly was elected. McCarvill unsuccessfully stood at the 1948 general election in Monaghan for Clann na Poblachta.
Prior to being fully qualified McCarvill helped in training of members of Cumann na mBan after the 1916 Easter Rising and during the Irish War of Independence in first aid in Harcourt Street, along with Doctor Kathleen Lynn and Doctor Geraghty.