Sinéad O'Hart was born on a long-ago Monday in one of the many corners of Ireland. She grew up - not very far up, to be honest - with one brother and two parents, in a small house full of books. She always wanted to be an author, but somehow managed to wander through a variety of careers (including butcher, bookseller, and university lecturer, among others) before finally getting around to what she should have been doing all along, which was writing.

Her first book, THE EYE OF THE NORTH, was published by Knopf BFYR (US/Canada) in 2017, and by Stripes Publishing (UK/Ireland) in 2018. Her second book, THE STAR-SPUN WEB, came out in 2019 (Stripes, UK/Ireland; Knopf BFYR, US/Canada). In 2021 she published THE RAVENS' CALL with Harper Collins Children's Books and a third novel with Stripes/Little Tiger Press, SKYBORN, a prequel to her first book, The Eye of the North. Her fourth and fifth novels, THE TIME TIDER and THE SILVER ROAD, came out in 2023, the former with Stripes/Little Tiger Press and the latter with Piccadilly Press. In 2024 she began publishing her series of younger readers with Nosy Crow, beginning with LOLA AND LARCH FIX A FAIRY FOREST. Three titles in this series published in 2024, along with her sixth novel, SWORD OF THE SUN (Piccadilly Press).

She lives with one husband and one energetic youngster in the midlands of Ireland, in a small house full of books.