Geoffrey A. Landis is a scientist and a science fiction writer. He is the author of one novel, Mars Crossing (2000, Tor), which won the Locus award for best novel. His short story collection, Impact Parameter and Other Quantum Realities (2001, Golden Gryphon) includes "A Walk in the Sun," (Hugo winning short story, 1992), as well as several other Hugo- and Nebula finalist. He also won the Hugo in 2003, for "Falling onto Mars," and won the Nebula in 1990, for "Ripples in the Dirac Sea." His works have been translated into 21 languages. His most recent story, "Betting on Eureka," appeared in the Oct/Nov issue of Asimov's SF. An upcoming story, "Derelict," will appear in the anthology Escape from Earth, to appear in November from the Science Fiction Book club. He was a 1985 Clarion graduate, and a finalist for the John W. Campbell Award as Best New Writer of 1985.

He is currently a scientist at the NASA John Glenn Research Center, and is the Ronald McNair Visiting Professor of Astronautics at MIT. He lives in Berea, Ohio and Cambridge, Massachusetts with his wife, writer Mary Turzillo, and two cats.