Note biografiche e bibliografia di J.N. Williamson
Nel 1987 si dedicò al saggio How to Write Tales of Horror, Fantasy & Science Fiction, volume che con il contributo di altri importanti scrittori racconta i temi della scrittura horror e cita opere di scrittori come Robert Bloch, Lee Prosser, Richard Matheson, Ray Bradbury, HP Lovecraft, August Derleth, William F. Nolan e Stephen King. .
Per un lungo periodo curò Masques, una popolare serie di antologie che divenne vero trampolino di lancio per scrittori affermati e non.
- Ghost Mansion
- Ghost Mansion 1981
- Horror Mansion 1982
- Lamia Zacharius
- Death-Coach 1981
- Death-Angel 1981
- Death-School 1982
- Death-Doctor 1982
- Martin Ruben
- The Ritual 1979
- Premonition 1981
- Brotherkind 1982
- The Houngan 1980 o Profits 1984
- Horror House 1981
- Queen of Hell 1981
- The Banished 1981
- 1983 - Gli emarginati - Urania 949, Arnoldo Mondadori Editore
- The Tulpa 1981
- Extraterrestrial 1982 (come Julian Shock)
- Playmates 1982
- The Evil One 1982
- The Dentist 1983
- The Offspring 1984
- Ghost 1984
- Babel's Children 1984
- The Longest Night 1985
- Wards of Armageddon 1986 (con John Maclay)
- Noonspell 1987
- Evil Offspring 1987
- Dead to the World 1988
- The Black School 1989
- Shadows of Death 1989
- Hell Storm 1991
- The Night Seasons 1991
- The Monastery 1992
- The Book of Webster's 1993 o Spree 1998
- Don't Take Away the Light 1993
- Bloodlines 1994
- The Haunt 1999
- Affinity 2001
- Anomalies 1983
- Nevermore! 1983
- The Naked Flesh of Feeling 1991
- The Fifth Season 1993
- Frights of Fancy 2000
- SPWAO Showcase
- 7 SPWAO Showcase #7, 1989-1990 1989
- Masques
- Masques 1984
- Masques II 1987 o Masques Two 1989
- 1988 - Masques II - Horror Story 1, Garden Editoriale
- Masques III 1989 o Fleshcreepers 1990
- Masques IV 1991
- Masques V 2006 (con Gary A. Braunbeck)
- The Best of Masques 1988
- Dark Masques 2001 (raccolta contiene i volumi 1-2 della serie)
- Darker Masques 2002 (raccolta contiene i volumi 3-4 della serie
- Time to Murder 1966
- They Never Even See Me 1970
- Golden Years 1976
- Statement of the Accused 1977 o Home Free 1977
- "Absolute Peace and Quiet" 1983
- Anything to Help the Duke 1983
- Belonging 1983
- Keeping Christmas 1983
- Stalemate 1983
- The Dotted Line 1983
- Turning 40 for Fun and Prophet 1983
- Review of the Latest Arrivals 1983
- Leitmotif 1984
- Milestones 1984
- Vital Parts 1984
- House Mothers 1984
- Nature and Mr. Humphries 1984
- Small Gift from Home 1984
- The Bus People 1985
- The Dearly Departed 1985
- The Gap Nearly Closed Today 1985
- Uncoverup 1985
- "Don't" 1985
- A Matter of Identification 1985
- Little Doll from the Backwoods 1985
- Souvenir 1985
- Aspirations 1985
- I'll Give You My Magic, If You'll Give Me Your Love 1985
- Orwell Redux 1985
- Flush 1985 with Milton Hillman
- One Look at You & the Earth Moves Beneath My Feet 1985
- Bleed Bargaining 1986
- Hellter-Shelter! 1986
- If I Make My Bed in Hell 1986
- Renunciations 1986
- The Book of Webster's 1986
- The Bountiful Spirit 1986
- The Night Seasons 1986
- The Scars of Bonding 1986
- The House of Life 1986
- The Legend of Lincoln County 1986
- The Queerness of Time 1986
- The Final Stages of the Creeping Crud 1986
- Devil's Powder 1986
- Conspiracies 1987
- Privacy Rights 1987
- Starry Coping 1987
- The Better Half 1987 (con John Maclay)
- Townkiller 1987
- Wordsong 1987
- 1988 - Wordsong in Masques II - Horror Story 1, Garden Editoriale
- 1995 - Wordsong in Popsy e altri racconti - Economica Tascabile 23, Fanucci Editore
- Happy Hour 1987
- Watchwolf 1987
- After-Howl 1988
- Fancy That 1988
- Nosmael 1988
- Public Places 1988
- Mercy 1988
- Two Floor Generals and the Sweetheart Dance 1988
- Amorphous 1988
- Jezebel 1989
- Monstrum 1989
- 1989 - Monstrum in Estate Horror 1993. Mostri. 37 racconti - Horror 4, Arnoldo Mondadori Editore
- The Unkindest Cut 1989
- Overnight Pass 1989 (con John Maclay)
- You'd Better Watch Out 1989
- Too Hideous to be Played 1989
- Everyone Must Know... 1989
- Pact 1989
- Vampire Nostalgia 1989
- The Sudd 1989
- Parnassus on Wheels II 1990
- The Bridge People 1990
- My Brother, the Sex Fiend 1990 (con D.W. Taylor)
- Sleepover 1990
- Happier Endings 1990
- Wotan's Oak 1990
- No Love Lost 1991
- Something Extra 1991 (con James Kisner)
- The Oldest Human Trick 1991
- Herrenrasse 1991
- Collaborationists 1991
- Land of the Second Chance 1991
- Eater of the Dead 1992
- The Train Man 1992
- Watchful Eyes 1992
- Free Among the Dead 1992
- The Girl of My Dreams 1992
- Cycles 1993
- God's Mouth to Your Ear 1993
- Health Hazard 1993
- Just One More Thing People Can Do 1993
- Reality Function 1993
- Snowlight 1993
- The Carolers 1993
- Troth 1993
- Dead Body Run 1993
- Frankenstein Seen in the Ice of Extinction 1993
- Child of the Sea 1994
- Indecent Proponent 1994
- The Autonomic Nervous System, Klaus Von Clausewitz, and Omilian 1994
- The Field of Blood 1994
- The Last Nazi Invasion 1994
- Mostly the Evil Shows 1994
- The Vardoger 1994
- Origin of a Species 1995
- Time Tells Us 1995
- Vladimir's Conversions 1995
- The Mother Pact 1995
- High Concept 1995
- A Misunderstanding at Midnight 1995
- The Last Link Between Life and Death 1995
- Beasts in Buildings, Turning 'Round 1996
- On the Late Train Through Texas 1996
- Two Hands Are Better Than One 1996
- Hildekin and the Big Diehl 1996
- The Piano Player Has No Fingers 1997
- It Does Not Come Alone 1997
- A. Pyme 2000
- Pick-Up 2000
- When Nature Itself Creates Them 2000
- Outcry 2006