The Box (1969)
Do It To Me (1969)
Born to Give (1969; with Swap Club by Greg Hamilton & Wild in Bed by Dirk Malloy)
Campus Doll (1969; with High School Stud by Robert Hadley)
A Way With All Maidens (1969)
As Howard Lee
Kung Fu #1: The Way of the Tiger, the Sign of the Dragon
As Lee W. Mason
Lady of a Thousand Sorrows (1977)
As K. M. O’Donnell
Empty People (1969)
The Final War and Other Fantasies (1969; stories)
Dwellers of the Deep (1970)
Gather at the Hall of the Planets (1971)
In the Pocket and Other S-F Stories (1971; stories)
Universe Day (1971; stories)
As Elliot B. Reston
The Womanizer (1972)
As Gerrold Watkins
Southern Comfort (1969)
A Bed of Money (1970)
A Satyr’s Romance (1970)
Giving It Away (1970)
Art of the Fugue (1970)
NON-FICTION/ESSAYS
The Engines of the Night: Science Fiction in the Eighties
(1982; essays)
Breakfast in the Ruins (2007; essays: expansion of Engines of the Night)
The Business of Science Fiction: Two Insiders Discuss Writing and Publishing (2010; with Mike Resnick)
The Bend at the End of the Road (2018; essays)
EDITED ANTHOLOGIES
Final Stage (1974; with Edward L. Ferman)
Arena (1976; with Edward L. Ferman)
Graven Images (1977; with Edward L. Ferman)
Dark Sins, Dark Dreams (1978; with Bill Pronzini)
The End of Summer: SF in the Fifties (1979; with Bill Pronzini)
Shared Tomorrows: Science Fiction in Collaboration (1979; with Bill Pronzini)
Neglected Visions (1979; with Martin H. Greenberg & Joseph D. Olander)
Bug-Eyed Monsters (1980; with Bill Pronzini)
The Science Fiction of Mark Clifton (1980; with Martin H. Greenberg)
