Steadman was educated at The King's School, Canterbury, from 2005, attending on music and academic scholarships, followed by languages and law at Selwyn College, Cambridge, in 2017, and a master's degree in creative writing at Cambridge.
[1] In 2020, Steadman received a "seven-figure" three-book contract for a fantasy series about "bloodthirsty unicorns".
[1] This is believed to be the largest ever advance deal for a debut children's writer.
[4] In November 2022, it was announced that Simon & Schuster had acquired three more books from Steadman.
The fourth book in the series, Skandar and the Skeleton Curse, was published on 10 October 2024.