He worked as a junior reporter for the Saunders Newsletter, a Dublin Conservative daily newspaper and then for Freeman's Journal while studying part-time for the Bar.

Keller, who was the parish priest of Youghal, was called to give evidence in the Bankruptcy Court regarding the financial circumstances of some of his Parishioners involved in the "Plan of Campaign" rent strikes.

Keller refused to answer questions on the grounds that he had obtained this information in his capacity as a confessor, and that breaching the seal of the confessional contravened Catholic Canon law.

As a judge he was not highly regarded; his pompous manner in Court led to unkind comparison with a bullfrog; more seriously there were frequent complaints that his constant interruptions from the Bench made it almost impossible for counsel to present their cases properly.

Out of consideration for Irish Nationalist opinion, O'Brien remained in office and was created a Baronet, of Ardtona in the Parish of Dundrum in the County of Dublin, in 1916.

[3] A constitutional nationalist who supported home rule without breaking the imperial link with Great Britain, O'Brien was opposed to the aims and methods of Sinn Féin.

In 1926–27 he wrote a memoir, which was published by Four Courts Press, Dublin in 2021, Baron Shandon had no issue but wished to pass on his titles to his nephew but, in order to achieve this, he would need a Letter of Remainder, which could be acquired by an application to the Crown Office at the House of Parliament, Westminster.

Previously Gerald Horan had been Permanent Secretary to the Lord Chancellors of Ireland, Clerk of the Crown and Hanaper, Keeper of the Seal and Captain of the Guard of the Purse Baron Shandon died in London on 10 Sept. 1930, Probate Granted London on 23 Oct.1930 Gerald Horan KC held the position of Master of the High Court in Ireland up until a few days before his death from ill health at his residence, St. Peter's, Ailesbury Road, Dublin 4.

The decision that Gerald Horan KC came to was that the Seal Making Equipment should be entrusted to the safe keeping of the National Museum where both parties could ponder the same, and that is where it is up to this date.

This was written to provide a clear understanding of Circuit Court procedure and became required reading for all involved - in his Last Will and Testament, dated 27 Jan 1938, he left all 'his property of every nature and kind whatsoever and wheresoever’ to his wife Kathleen.

During that time he compiled and edited a definitive book on the matter entitled ‘Mining Court and Mining Commissioners Cases' Vol:3 In his Last Will & Testament dated 14 May 1975 - he passed The Letters Patent to both Baronetcy and Barony, along with the Lord Chancellor’s Purse, the silver casket containing the Freedom of the City of Cork, various other historical letters patent and other artefacts including Baron Shandon’s Memoirs to his son Niall Patrick Horan Desmond Gerald Horan died in Dublin on 4 June 1975, Probate Granted Ontario, Canada 29 Sept. 1975 (5853/75) Niall Patrick Horan, after many years of deliberation, petitioned the Chief Herald of Ireland for a Grant of Arms to reflect the historic nature of the family history, the relationship to and the decision of Baron Shandon.