| Early Life | Eldest of five children, born to Tim Buckley (hotel bar manager and poet) and Marina Cassidy (vocal coach, music psychotherapist, singer, harpist). Grew up without television, acted in school musicals including male lead in West Side Story. Studied music (harp, piano, saxophone, clarinet) at Royal Irish Academy of Music (RIAM), received RIAM High Achiever Award in 2001. |
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| Career Start | Runner-up on BBC talent show I'd Do Anything (2008). West End debut in A Little Night Music (2008). Graduated from Royal Academy of Dramatic Art (RADA) in 2013. |
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| Breakthrough | Film debut in Beast (2017). Breakthrough in Wild Rose (2018), BAFTA nomination. Notable roles in Chernobyl (2019), The Lost Daughter (2021, Oscar nomination), Hamnet (2025, Academy Award, Golden Globe, BAFTA). |
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