 He was a Member of Parliament (MP) for Kildare Borough between 1776 and 1783 and represented then Athy between 1790 and 1791.From 1790 to 1798, he sat in the Irish House of Commons for Dublin City.On 8 July 1806, he was appointed to the Privy Council of Ireland, and from 1807 until 1814, Lord Henry served in the Parliament of the United Kingdom for Kildare.