Which of his movies have you seen

All of them.

Dark Star - love this movie, what they achieved with the budget and because Dan O'Bannon was involved, the music
Assault on Precinct 13 - good movie, the tension
Halloween - there's a great scene where the camera follows her from memory, and the music
The Fog - don't remember it too well
Escape from New York - great movie, great cast
The Thing - great movie, great cast
Christine - good
The Philadelphia Experiment - great time travel movie but a bit silly to many
Starman - good, but don't watch it much
Black Moon Rising - don't remember much
Big Trouble in Little China - a lot of fun
They Live - okay, has a great fistfight scene
Memoirs of an Invisible Man - a lot of fun, probably Chevy Chase's last great movie
Escape from L.A. - not so good
Ghosts of Mars - forgettable

Escape From New York
Escape From LA (seems like a parody of EFNY, where a lot of the same shit happens)
The Thing (Number one Carpenter movie imo)
They Live
Halloween
Prince of Darkness
Vampires
Village of the Damned
In the Mouth of Madness
Big Trouble in Little China (one of my favorites)
The Fog
Christine (didn't like that one)
Ghost of Mars (WTF?)
Starman
Memoirs of an invisible man
Assault on precinct 13

Assualt on Precinct 13 (1976)
Someone's Watching Me! (1978)
Halloween (1978)
The Fog (1980)
Escape from New York (1981)
The Thing (1982)
Christine (1983)
Big Trouble in Little China (1986)
Prince of Darkness (1987)
They Live (1988)
Body Bags (1993)
In the Mouth of Madness (1994)
Village of the Damned (1995)
Escape From L.A. (1996)
Vampires (1998)
Ghosts of Mars (2001)
Cigarette Burns (2006) - From the Masters of Horror televsion series
The Ward (2010)