Morrissy was educated at the Rathmines School of Journalism. She worked in Australia, and as a sub-editor of The Irish Press.[1] She has taught creative writing for the University of Arkansas, and University of Iowa creative writing summer programmes. In 1995, she was awarded a Lannan Literary Award for Fiction.
Marcella's voice will be familiar to BBC Radio listeners for her roles in numerous plays and poetry readings. She's a recipient of the BBC Radio Best Actress Sony Award for her performance in The Old Jest. Television credits include the leading role in The Long March (winner of TV Drama Samuel Beckett Award). Audiobooks narrated by Marcella include Ulysses and Finnegan's Wake by James Joyce.