McGinnity was appointed junior dean at
St Patrick's College, Maynooth, Ireland's national seminary, when he was 26 years old. He was appointed senior dean at the age of 32 in 1978, decades younger than previous holders of the post. In 1984, he raised concerns with bishops about the sexuality of the college's vice-president, Dr
Micheál Ledwith. After his complaint was dismissed in the absence of any evidence, McGinnity was required to leave his position by
Tomás Ó Fiaich, archbishop of his home diocese, acting on behalf of the trustees (17 bishops) of the college. Several seminarians sought the advice of
Brendan Comiskey, then auxiliary Bishop of Dublin and later
Bishop of Ferns, about the lifestyle of Ledwith and their concerns that he might be gay. Comiskey suggested that they approach seven "key bishops" in order that their concerns be adequately heard. These bishops included the Cardinal Primate of All Ireland Tomás Ó Fiaich and Bishops
Cahal Daly,
Edward Daly, Lennon, Cassidy, C O'Reilly,
Eamon Casey and Aherne. Ledwith was appointed president of St Patrick's in 1984. In 1994, he resigned prematurely and agreed a financial settlement – without liability – with a man who alleged Ledwith had abused him as a minor, and later left the Church. ==The McCullough and Ferns Reports==