Raised in the Midwest, Greer Macallister is a novelist, poet, short story writer, and playwright who earned her MFA in Creative Writing from American University. Her debut novel The Magician's Lie was a USA Today bestseller, an Indie Next pick, and a Target Book Club selection. It has been optioned for film by Jessica Chastain's Freckle Films. Her novel Girl In Disguise, also an Indie Next pick, received a starred review from Publishers Weekly, which called it "a well-told, superb story." She lives with her family in Washington, DC.

She also writes epic fantasy as G. R. Macallister.