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".