A Korean-American sf/f writer who received a B.A. in math from Cornell University and an M.A. in math education from Stanford University, Yoon finds it a source of continual delight that math can be mined for story ideas. Yoon's novel Ninefox Gambit won the Locus Award for best first novel, and was a finalist for the Hugo, Nebula, and Clarke awards; its sequels, Raven Stratagem and Revenant Gun, were also Hugo finalists. His middle grade space opera Dragon Pearl won the Locus Award for best YA novel and was a New York Times bestseller. Yoon's short fiction has appeared in publications such as F&SF, Tor.com, and Clarkesworld Magazine, as well as several year's best anthologies.