He went to the Irish College at Douai in 1617 and later to Leuven. He received his education at the Franciscan Monastery in Kiltybegs, the in Louvain. He was ordained a priest in 1625 and appointed as Bishop of Down and Connor in 1641. He played a prominent part in the Irish Catholic Confederation in Kilkenny.
He was appointed Roman Catholic Bishop of Clogher in June 1643. He worked closely with Owen Roe O'Neill throughout the 1640's and liased with Rinuccini after his arrival in 1645. Following the mysterious death of Owen Roe O'Neill on 6th November 1649, leadership of Ulster army of 5,000 foot soldiers and 600 cavalry was entrusted to Bishop McMahon by the Earl of Ormonde. In 1650 McMahon took Dungiven, but the Irish forces were then routed by Cromwell’s army at the battle of Scarrifholis, near Letterkenny, in June of that same year. Although he escaped, he was captured, hanged and beheaded by Sir Charles Coote in Enniskillen. He died in office in July of 1650.
US Patent Issued to University of Chicago on Sept. 11 for "Automated Method and System for the Evaluation of Disease and Registration Accuracy in the Subtraction of Temporally Sequential Medical Images" (Illinois Inventors)
Sep 16, 2012; ALEXANDRIA, Va., Sept. 16 -- United States Patent no. 8,265,728, issued on Sept. 11, was assigned to University of Chicago...