Kate Heartfield is a Canadian author of fantasy, science fiction, horror,[1] as well as a non-fiction writer and editor.
[2] Heartfield's writing has appeared in various periodicals, anthologies and podcasts, including Alice Unbound: Beyond Wonderland, Black Treacle, Clockwork Canada, Curiosities, Daily Science Fiction, Escape Pod, 49th Parallels, GlitterShip, Kaleidotrope, Lackington's, Liminal Stories, Monstrous Little Voices: New Tales from Shakespeare's Fantasy World, Murder Mayhem Short Stories, On Spec, PodCastle, Postscripts to Darkness #4, Shades Within Us: Tales of Migrations and Fractured Borders, Spellbound, Strange Horizons, Tesseracts Twenty-One: Nevertheless, Tesseracts Twenty-Two: Alchemy and Artifacts, and Waylines.
[3] In June 2022, Heartfield was announced as the author of then-upcoming Assassin's Creed novel The Magus Conspiracy as part of the series' 15th anniversary celebration.
In August 2024, Heartfield revealed on Twitter that, despite the initial announcement of The Engine of History as a trilogy, the publisher had no current plans for a third book in the series.
Her stories "The Seven O'Clock Man," "Not Valid for Spain," and "A Threadbare Carpet" were preliminary nominees for the Sunburst Award.