Bishop Michael Morrissey is the ninth Bishop of Geraldton in Western Australia and is the first Bishop of Geraldton who was born, raised, ordained and ministered in the Diocese.

Born in St John of God Hospital, Geraldton, on 9 September 1952, Bishop Morrissey grew up on a station in Yalgoo. He received his primary school eduation via Correspondence and School of the Air Lessons supervised by his Mother, Margaret Morrissey. His secondary education was received as a boarder at Aquinas College, Perth. He continued his studies at St Charles Seminary in Perth and at St Francis Xavier Seminary, Adelaide, South Australia. He was then Ordained a Priest on 31 January 1981 in St Francis Xavier Cathedral, Geraldton. From 1981 - 1984 he worked as Assistant Priest in the Parishes of Bluff Point and Port Hedland. In 1985 his first appointment as a Parish Priest was in Karratha, where he remained until 1992. He then relocated to Geraldton to be Administrator of St Francis Xavier Cathedral until 2007 when he accepted the appointment as Parish Priest of Mullewa. He returned as Adminstrator to the Cathedral in 2014 and continued in this role until his appointment as Bishop of Geraldton.

Bishop Morrissey also served as an Army Chaplain from 1983 until 2016, achieving the rank of Lieutenant Colonel. 

His Episcopal Ordination was celebrated on the eve of the Feast of Saints Peter and Paul, Wednesday 28 June, at the Nagle Catholic College Gymnasium, in Geraldton due to St Francis Xavier Cathedral being closed for interior renovations. Bishop Morrissey adopted as his motto "Trust in the Lord" from Proverbs 3:5.