Sullivan came from a family of wealthy Kilkenny merchants who engaged in malting and milling and owned a successful brewery in James Street, Kilkenny.
Elected as a freeman of the city in 1819, Sullivan attended an aggregate meeting of Catholics in Kilkenny for emancipation in January 1827, although he was later to be criticised for having ‘stood at a supercilious aristocratic distance from the popular cause’.
Sullivan was ‘most happy’ to attend O’Connell’s National Council in Dublin in January 1833, where he reported on the amount of property possessed by the corporation of Kilkenny.
In June 1833 Sullivan supported O’Connell’s proposal to postpone bringing the question of repeal before parliament, although Feargus O’Connor subsequently claimed that Sullivan had afterwards expressed a desire to change his vote.
Having been accused, perhaps unfairly, of absenteeism in the previous session, Sullivan returned to Westminster in 1834 to support O’Connell’s motion for a select committee on the conduct of the Irish baron of exchequer, Sir William Cusack-Smith, 13 Feb. He voted in favour of a revision of the pension list, 18 Feb. (and again, 5 May), but divided against Hume’s motion for a fixed duty on corn, 7 Mar.
Admitted to the Anti-Tory Association on 6 December 1834, Sullivan re-affirmed the promises he had previously made on repeal, the abolition of tithes, and parliamentary reform, and was re-elected after only a token challenge at the 1835 general election.
O’Connell had raised the question of whether Sullivan might retire at the next general election, and he agreed to ‘resign his trust into the hands of his constituents’ whenever required, furnishing O’Connell with a letter of resignation ‘for use at his discretion’.
Sullivan was a substantial investor in the Dublin and Kilkenny railway from 1837 and joined the provisional committee of the Dublin, Kilkenny and Cashel railway in 1844. For many years he took ‘a leading part in the discharge of public business in Kilkenny’, serving as an alderman of the city before being elected mayor in June 1838. A borough magistrate from 1845, he served as high sheriff in 1847, the year in which his younger brother, Michael, was returned as MP for the city.
Having been ‘in a somewhat feeble state of health for some time’, Sullivan died suddenly from ‘an apoplectic attack’ in March 1855.
