World Fantasy Award-winning anthologists David G. Hartwell and Kathryn Cramer have compiled a definitive overview of this subgenre, both as it was in the days of the pulp magazines, and as it has become since. Included are major works from genre progenitors like Jack Williamson and Leigh Brackett, stylish mid-century voices like Cordwainer Smith and Samuel R. Delany, popular favorites like David Drake, Lois McMaster Bujold, and Ursula K. Le Guin, and modern-day pioneers such as Iain M. Banks, Steven Baxter, Scott Westerfeld, and Charles Stross.