Editor

• The New York Review of Science Fiction (1988—present) with Kathryn Cramer and Ariel Haméon and Kevin J. Maroney and Arthur D. Hlavaty and Matthew Appleton and others

Anthology series

• The Dark Descent
• The Dark Descent (1987)
• The Colour of Evil (1990)
• The Medusa in the Shield (1990)
• A Fabulous Formless Darkness (1992)

• Year's Best SF
• Year's Best SF (1996)
• Year's Best SF 2 (1997)
• Year's Best SF 3 (1998)
• Year's Best SF 4 (1999)
• Year's Best SF 5 (2000)
• Year's Best SF 6 (2001)
• Year's Best SF 7 (2002) with Kathryn Cramer
• Year's Best SF 8 (2003) with Kathryn Cramer
• Year's Best SF 9 (2004) with Kathryn Cramer
• Year's Best SF 10 (2005) with Kathryn Cramer
• Year's Best SF 11 (2006) with Kathryn Cramer
• Year's Best SF 12 (2007) with Kathryn Cramer
• Year's Best SF 13 (2008) with Kathryn Cramer
• Year's Best SF 14 (2009) with Kathryn Cramer

• Foundations of Fear
• Foundations of Fear (1992)
• Visions of Fear (1994)

• Year’s Best Fantasy
• Year’s Best Fantasy (2001) with Kathryn Cramer
• Year’s Best Fantasy 2 (2002) with Kathryn Cramer
• Year’s Best Fantasy 3 (2003) with Kathryn Cramer
• Year’s Best Fantasy 4 (2004) with Kathryn Cramer
• Year's Best Fantasy 5 (2005) with Kathryn Cramer
• Year's Best Fantasy 6 (2006) with Kathryn Cramer (Tachyon Publications)
• Year's Best Fantasy 7 (2007) with Kathryn Cramer (Tachyon Publications)

Stand alone anthologies

• The Battle of the Monsters and Other Stories (1976) with L. W. Currey
• The World Treasury of Science Fiction (1988)
• Masterpieces of Fantasy and Enchantment (1988) with Kathryn Cramer
• Spirits of Christmas (1989) with Kathryn Cramer
• Christmas Stars (1993)
• Christmas Forever (1993)
• Christmas Magic (1994)
• Northern Stars: The Anthology of Canadian Science Fiction (1994) with Glenn Grant
• The Screaming Skull and Other Great American Ghost Stories (1994)
• The Ascent of Wonder: The Evolution of Hard SF THE ASCENT OF WONDER, edited by David G. Hartwell and Kathryn Cramer (1994) with Kathryn Cramer
• Masterpieces of Fantasy and Wonder (1994) with Kathryn Cramer
• Visions of Wonder (1996) with Milton T. Wolf
• The Science Fiction Century (1997)
• Bodies of the Dead and Other Great American Ghost Stories (1997)
• Northern Suns (1999) with Glenn Grant
• Centaurus: The Best of Australian Science Fiction (1999) with Damien Broderick
• The Hard SF Renaissance (2002) with Kathryn Cramer
• The Science Fiction Century, Volume One (2006)
• The Space Opera Renaissance (2006) with Kathryn Cramer (Tor Books)

Nonfiction

• Age of Wonders: Exploring the World of Science Fiction (1985)