John Henry Mac Mahon was born in Dublin. He graduated at Trinity College, Dublin in 1852, was ordained deacon in 1853, and became Secretary of the Board of Religious Education of the General Synod of the Church of Ireland. He is author of A Treatise on Metaphysics Chiefly in Reference to Revealed Religion, published in 1860. By recourse to Thomas Aquinas and Francis Suarez, Mac Mahon argues that revealed religion provides the standard for measuring the precise limits of the science of metaphysics. He contributed to Bohn's classical library The Metaphysics of Aristotle, Literally Translated from the Greek, with Notes, Analysis, Questions and Index, published in 1857, and to Clarke's Ante-Nicene Christian Library The Refutation of All Heresies by Hippolytus, translated in 1868.
From The Continuum Encyclopedia of British Philosophy in Oxford Reference.