Kevin J Anderson, who's written tons of books but specifically (as far as interests me) one with Dean Koontz, and all three X-Files novels that I own...
Juliet Marillier, whose Sevenwaters Trilogy I totally love...
Martha Wells, who wrote the Stargate Atlantis novel Reliquary, which was totally better than I expected it to be...
and... one by Sharon Shinn! OMG!