Born and raised in the village of Borris, Co Carlow, Sarah Breen started her career in journalism at KISS magazine. Since then her writing has appeared in many Irish print publications, as well as online. In 2017 she co-wrote her debut novel Oh My God, What A Complete Aisling with her long-time friend Emer McLysaght, and it went on to become an Irish Times No 1 bestseller. The second book in the Aisling series, The Importance of Being Aisling was published in 2018 and won the Popular Fiction Book of the Year at the Irish Book Awards. 

She lives in Dublin 7 with her husband and two daughters and dreams of the day Oasis will reunite.