Orlagh Cassidy was born and raised on Capitol Hill in Washington DC, the youngest of four children, her parents having settled there from Dublin Ireland.
She began her professional acting career at age fourteen working at The Shakespeare Theatre at The Folger where she performed the prologue in ‘Troilus and Cressida.’ During the spring of her senior year of high school she performed in ‘Midsummer Night’s Dream’ and upon graduating became an apprentice company member at The Folger for one season performing eight shows a week for ten months in classics by Moliere, Shakespeare and Chekhov where she played roles such as Anne Page in ‘The Merry Wives Of Windsor‘ and Anya in ‘The Cherry Orchard.’ She also spent a summer studying at The National Theatre in Great Britain and from there she went to SUNY at Purchase where she received her BFA along with The Princess Grace Foundation Award.
She made her Broadway debut in Noel Cowards’ ‘Present Laughter’ with Frank Langella and Alison Janney. Off Broadway credits include ‘The Ruins Of Civilization’ at ‘Manhattan Theatre Club,’ ‘Bright Ideas’ at Manhattan Class Company, ‘The Hundred We Are’ at Origin Theatre, and the mobile unit production of ‘Hamlet‘ at ‘The Public Theatre.’ She received a Drama Desk Award nomination in 2007 for her role as Maggie in ‘The Field‘ at The Irish Repertory Theatre where she also appeared in ‘The Aristocrats‘ and ‘Dancing At Lughnasa.’ Regionally she has performed at theatres such as Hartford Stage, Philadelphia Drama Guild, The Oslo Theatre, and Indiana Rep.
She has been a frequent guest star on television shows including ‘Homeland,’ ‘Billions,’ ‘The Good Wife,’ ‘Elementary,’ ‘Veep,’ ‘Unforgettable,’ ‘The Mysteries Of Laura,’ ‘Law and Order,’ and eleven year run as ‘Doris Wolfe’ on ‘Guiding Light.’ Film credits include ‘Beach House,’ ‘The Sisterhood Of Night,’ and ‘St. Vincent‘ with Bill Murray. She is a veteran commercial, television, voice actor and multiple award winning audiobook narrator.