died in 2010 at far too early an age...if you like Sci-Fi time travel combined with Corporate Overlords, lots of camp (and camping) and references to classic films, this is the one to read.
The main novel sequence goes:
In the Garden of Iden
Sky Coyote
Mendoza in Hollywood
The Graveyard Game
The Life of the World to Come
The Children of the Company
The Machine's Child
The Sons of Heaven
There's a bunch of short stories, but as I recall you don't need them for continuity; if you want to read them, interspersing them among the main books where LibraryThing suggests works pretty well. Of the prequels, you can read The Empress of Mars whenever you feel like it; it's set in the same universe, but it's a totally independent story. I haven't read Not Less Than Gods yet, but the summaries I've seen of it online make it sound really spoilerish, so you should probably save it for last or near-last.
Her surviving sister has taken over the franchise, trying to commit all the plot ideas left behind to paper. Her diary is a tribute to sisterhood, commitment, and art. It will make you cry.
Kathleen, Kage and the Company http://doctorzeus.co/