Siobhán,
I just discovered this post and hope I can be of help to you. Rev. Arthur McGinnis was born Arthur Michael McCreesh (McGinnis/McGuinness) in Dorsey c. 1835 and was probably the son of Owen McCreesh & Mary Loy (see A Biographical Directory of 19th Century Catholic Clergy from the Parish of Lower Creggan, County Armagh by Kieran McConville of Cullyhanna). He and my great-grandfather, Francis McCreesh may have been cousins. For whatever reason, many of the McCreesh would use the McGuinness surname when they left Ireland. In fact, the McCreesh (MacRaois) sept were a branch of the McGuinness clan and I've found baptismal and civil records for my grandfather and his siblings in Ireland that use both surnames.
Accoring to Kieran's biography, Fr. Arthur came to America and entered St. Charles Borrmeo Seminary in Wynewood, PA (literally across the street from Philadelphia). He was ordained at the Cathedral of SS Peter & Paul by Bishop Wood on 3 June 1860. The most interesting episode in his history surrounds the events that occurred during his tenure at St Francis Xavier in Gettysburg, Pa . If you are familiar with US history, you will know that that the bloodiest battle of our Civil War occurred during the 1st, 2nd, and 3rd of July 1863. As the battle raged, Fr. Mcguinness opened his church to the wounded of both sides, and asked his fellow church ministers to do likewise (there were between 45, 000 - 51,000 casualties as a result of this three day battle).
Fr. Arthur died 21 May 1873 and is buried 19 June 1873 in the Cathedral Cemetery in Philadelphia (Section M, Range 10 Lot 34, 2nd from East).
I hope this information is of help to you.
Elizabeth Tierney Budzilowicz
APG Genealogist