I read a couple of his entries in Tom Clancy's Ryanverse; Greaney did a great job of pumping some new life into a series that frankly seemed like it was on life-support - I thought his entries were very well written. I may have to give the "Grey Man" series a try.
Reading two at the moment:
Chapterhouse Dune - Frank Herbert; Back in my high school days, I read Dune and it's sequel Children of Dune and never made it any further. I picked up the 6 book set on my tablet last year and am now nearly done with Chapterhouse. On the plus side, I will say...