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Grier was a clergyman in the protestant Church of Ireland. In 1822 he was described as vicar of Templebodane, near Lisgoold, co. Cork, and chaplain to Charles Chetwynd-Talbot, 2nd Earl Talbot of Hensol (1777-1849), the Lord Lieutenant of Ireland. In 1828, when he wrote to the Duke of Newcastle, he was in Dublin and described himself as 'D.D'.
Grier wrote a number of pamphlets attacking the Roman Catholic church, and was a fierce opponent of Catholic Emancipation in Ireland. Among his works were a series of open letters between himself and the Rev. John Milner, Bishop of Castabala (1752-1826), entitled The end of religious controversy, published between 1821 and 1825. Grier's A defence of the reply to the "End of Religious Controversy" (London, 1825), was described as an answer to ... Dr. Milner's vindication of the principles of Popery.
In 1828, Grier published An epitome of the general councils of the Church from the Council of Nice, A.D. 325 to the conclusion of the Roman Council of Trent in ... 1563; and an appendix, containing some observations on the first four general Councils, Jewel's apology and Nowel's Catechisms (Dublin, 1828).