The Dragon Riders series is from Anne McCaffrey, I highly recommend this series. I don't recall how many books there are now, but it's got to be about 20. The last 3 books were written by Anne's son Todd, who is doing a decent job of it. He was smart enough to go to a different time in the world and not mess with the characters Anne had already created.
I'm currently reading my 4th book (out of order) of the Pendergast series by Douglas Preston and Lincoln Child.