- 2019 Grand Prix de l’Imaginaire for “Voyage avec l’Extraterrestre” (Touring with the Alien) in Bifrost
- 2019 Theodore Sturgeon Memorial Award Finalist, “Umbernight,” in Clarkesworld (February 2018)
- 2017 Hugo Award Finalist for Best Novelette, “Touring with the Alien,” in Clarkesworld (April 2016)
- 2017 Theodore Sturgeon Memorial Award 2nd place, “Touring with the Alien,” in Clarkesworld (April 2016)
- 2012 Hugo Award Finalist for Best Novella, “The Ice Owl,” in Fantasy and Science Fiction (November/December 2011).
- 2012 Nebula Award Finalist for Best Novella, “The Ice Owl,” in Fantasy and Science Fiction (November/December 2011)
- 2010 Nebula Award Finalist for Best Novella, “Arkfall,” in Fantasy and Science Fiction (September 2008).
- 1993 Nebula Award Finalist for Best Novelette, “The Honeycrafters,” in The Magazine of Fantasy and Science Fiction (October/ November, 1991).
- Second prize in Writers of the Future Contest, 1986
author, historian, museum consultant