Born July 10, 1941, in Salem, MA; son of Henry Geddes (an engineer) and Constance (a teacher; maiden name, Nash) Hartwell; married Patricia Lee Wolcott, August 30, 1969 (divorced, 1992); married Kathyrn Cramer (a writer), March 29, 1997; children: (first marriage) Alison, Geoffrey; (second marriage) Peter, Elizabeth. Education: Williams College, B.A., 1963; Colgate University, M.A. (with distinction), 1965; Columbia University, Ph.D. (comparative Medieval literature), 1975. Religion: Unitarian. Memberships: International Association for the Fantastic in the Arts, Modern Language Association, National Book Critics Circle, PEN American Center, Science Fiction Research Association, Council of Editors of Learned Journals. Addresses: Homeoffice: David G. Hartwell Inc., 153 Deerfield Lane, North Pleasantville, NY 10570-1430.

• Age of Wonders: Exploring the World of Science Fiction, Walker (New York, NY), 1984, revised edition, Tor (New York, NY), 1996.

• (With L. W. Currey) The Battle of the Monsters, Gregg Press (Boston, MA), 1977.
• (With Kathryn Cramer) Christmas Ghosts, Arbor House (New York, NY), 1987.
• The Dark Descent, Tor (New York, NY), 1987, published in three volumes as The Color of Evil, The Medusa in the Shield, and The Fabulous Formless Darkness, Tor (New York, NY), 1991-92.
• (With Kathryn Cramer) Spirits of Christmas, Wynwood Press (New York, NY), 1989.
• (With Kathryn Cramer) Masterpieces of Fantasy and Enchantment, St. Martin's Press (New York, NY), 1988.
• The World Treasury of Science Fiction, Little, Brown (Boston, MA), 1988.
• Foundations of Fear, Tor (New York, NY), 1992, published in three volumes as Shadows of Fear, Visions of Fear, and Worlds of Fear, 1994.
• Christmas Stars, Tor (New York, NY), 1992.
• (With Kathryn Cramer) Masterpieces of Fantasy and Wonder, Literary Guild (New York, NY), 1989.
• Christmas Forever, Tor (New York, NY), 1993.
• The Screaming Skull: And Other Great American Ghost Stories, Tor (New York, NY), 1994, special edition, 1995.
• Christmas Magic, Tor (New York, NY), 1994.
• (With Glenn Grant) Northern Stars: The Anthology of Canadian Science Fiction, Tor (New York, NY), 1994.
• (With Kathryn Cramer) The Ascent of Wonder: The Evolution of Hard SF, Tor (New York, NY), 1994.
• Bodies of the Dead, Tor (New York, NY), 1995, special edition, 1996.
• Year's Best Science Fiction, HarperCollins (New York, NY), 1996, 7th edition, 2002.
• The Science Fiction Century, Book-of-the-Month Club (New York, NY), 1996.
• David Drake, Lord of the Isles, Tor (New York, NY), 1997.
• (With Damien Broderick) Centaurus: The Best of Australian Science Fiction, Tor (New York, NY), 1999.
• (With Glenn Grant) Northern Suns, Tor (New York, NY), 1999.
• The Twentieth Century's Greatest Hits: A "Top-40" List, Forge (New York, NY), 2000.
• (With Kathryn Cramer) Year's Best Fantasy, Eos (New York, NY), 2001.
• (With Kathryn Cramer) The Hard SF Renaissance, Tor (New York, NY), 2002.

Editor, Cosmos (magazine), 1977-78. Also contributor of essays and book reviews to periodicals, including Crawdaddy, Locus, Publishers Weekly, New York Review of Science Fiction, New York Times Book Review, and Top of the News. Contributor toEditors on Editing, Harper (New York, NY), 1985.