On May 2, 1986, Morrissey was appointed to the Executive Council of Prince Edward Island as Minister of Transportation and Public Works.

[8] On November 22, 2014, Morrissey was nominated as the Liberal candidate in Egmont, for the 2015 federal election.

[9][10] On October 19, 2015, Morrissey won the election, defeating Conservative incumbent Gail Shea and New Democrat candidate Herb Dickieson.

He was also vice-chair of the Parish Council of St. Simon and St. Jude, and an organizer of the Tignish Irish Moss Festival prior to his election in 1982.

Morrissey was born at the Western Hospital in Alberton, Prince Edward Island, the son of Bernard and Marie (née O'Connor) Morrissey, who lived in Seacow Pond near Tignish, Prince Edward Island.