Séainín trained at the Guildford School of Acting (GSA) and the Irish Film Actors Studio.

Séainín made her professional stage debut in Peter Pan and The Mikado at The Lyric Theatre, Belfast. For the next six years she trained at the Lyric Drama Studio under some of Northern Ireland's leading practitioners.

She subsequently won leading child roles in the West End tours of The Sound of Music and Joseph at the Grand Opera House and was later chosen to sing solo at the Gala Concert EducAid at the Piccadilly Theatre in London's West End.

Already a familiar face, Séainín was then asked to present the cult BBC TV show Why Don't You? This led to Séainín winning the title of Young Champion for outstanding contributions to the Arts. She was next to be seen as Rosalia in the UK and Irish tour of West Side Story before taking up her place at GSA.

While at GSA, Séainín played numerous lead roles, which culminated in her performance as Guilietta Trapani in Aspects of Love.

Back in Ireland, She quickly became known as "our favorite once-upon-a-time character" for her memorable performances as Snow White in Snow White and the Seven Dwarves and Goldilocks in Goldilocks and the Three Bears at the Waterfront Concert Hall and the Millennium Forum before working for Tinderbox Theatre Company developing new plays by Martin Lynch and Darragh Carville.

Séainín moved to London to play Fanny in Excellent Beauty at the Union Theatre, London. Immediately after, Séainín played the lead role of Mary in the arena spectacular The Magical Rhythms of Ireland. A new musical directed by the award winning Dutch Director Jeroen Cardoso Lopez and choreographed by Belinda Murphy.

Back in London, Séainín began work on Other Women with Conor Mitchell at the Bridewell Theatre. Whilst there, Carol Medcalfe asked Séainín to perform at the Bridewell 10th Anniversary Gala Concerts, directed by Matt Ryan to mark the closing of the theatre.

Séainín then returned to Belfast to play Lotus Blossom in Aladdin for Dubbeljoint Theatre Company under the direction of Pam Brighton.

Séainín then returned to London to begin rehearsing for Conor Mitchell’s Other Women at Greenwich Theatre and after played Toffee Jenkins in The Pied Piper for Dubbeljoint Theatre Company back in Ireland. Directed by Pam Brighton, the show is adapted from the classic Robert Browning poem by playwright Adrian Mitchell.

Séainín started 2007 playing Regine in Ghosts at Bristol Old Vic. A Gritty, fresh and shocking new version by Frank McGuinness.

When Ghosts ended, Séainín went to Belfast to work with Cahoots Theatre Company on the new horror opera The Musician playing The Vile Little Girl. This new piece of theatre is written and directed by Conor Mitchell.

Séainín has just finished playing Helen Woods in Owen McCafferty’s Irish Premiere of Scenes from the Big Picture, directed by Conall Morrisson.

Scenes from the Big Picture received an Irish Times Theatre Nomination for BEST PRODUCTION at the Irish Times Theatre Awards in February 2008.

Read about Séainín's TV and Film credits.