Cusack-Smith was called to the
Irish Bar in 1788, having studied at
Lincoln's Inn, became
King's Counsel in 1795, and was made
Solicitor-General for Ireland in 1800. He was appointed a
Baron of the Exchequer in 1801 at the remarkably early age of 35. The appointment caused some adverse comments, both because of his youth and because he was already displaying signs of eccentricity. In April 1805 he was elected a
Fellow of the Royal Society. He was an eccentric judge who offended
Daniel O'Connell. O'Connell raised a motion, carried by
MPs on 13 February 1834, to appoint a select committee
to enquire into the conduct of Lord Smith in respect of his neglect of duty as a judge, and the introduction of political topics in his charges to grand juries. On the count of neglect, Cusack-Smith had been accused of rarely beginning his court sessions until after noon, occasionally running them until late into the night. but moved from early rejection of the
Act of Union to supporting it. Despite this reversal, his conscientious conduct as a judge was well thought of to the extent that he was even congratulated by voices among the
Repealers movement on his escape from parliamentary inquiry. Cusack-Smith represented
Lanesborough in the
Irish House of Commons from 1794 to 1798. Subsequently, he sat for
Donegal Borough until the
Act of Union in 1801. He was ill for some months before his death, but had appeared to recover. His death, at the family seat in Newtown, was sudden, and was generally believed to be
suicide. ==Family==