O'Neill is an actor and writer. Born in Dublin, and raised in Cork, she completed the Bachelor's degree in acting studies at the Samuel Beckett Centre at Trinity College and has since acted extensively for both stage and television. Her first play was produced by Fishamble Theatre Company as part of the site-specific series Whereabouts, winner of the judges' special award at the Irish Times Theatre Awards in 2007. Her second play They Never Froze Walt Disney (not listed here) was nominated for the Fishamble New Writing Award in 2008. Jody O'Neill is also co-curator of the Project Brand New initiative.