O’Callaghan during her career has gone across genres, continents, and a range of disciplines and passions including recording six solo CDs. A speaker of French, Spanish, and German, her early recordings focused on European cabaret, and she is considered a specialist in the music of Kurt Weill. She has sung with some of the world’s great ensembles and has performed at venues such as the London’s Royal Opera House to New York’s Noho cabaret Le Poisson Rouge. O’Callaghan recently completed a six-year stint as a Resident Artist at the Soulpepper Theatre Company and is currently a faculty member at The Banff Centre and Queen’s University. An accomplished songwriter, she recently co-wrote a new album with composer David Braid.