Hmmm....other than the two that aren't writing anymore - one due to death, the other due to well deserved retirement; (at least I'm assuming her last book was, well, her last
), most of mine is "what series are must reads" rather than "which author".
However a couple do come to mind, these are authors that I will read anything they write, no matter if it's a series, stand alone, or something I've never heard of before.
Sharyn McCrumb
Joan Hess
Most everyone else, if I think I'll like the series, I'll pick it up. If I like it, I'll then read all of that series, but no guarantees if they go to a different series. An example of this is Jim Butcher. I adore Dresden, but Codex...not so much.
Oh, and the aforementioned others?
Charlotte MacLeod/Alisa Craig (deceased)
Barbara Michaels/Elizabeth Peters (as I said, since she's in her 80's, I'm assuming her last book was it - much to my sorrow.)