Nick Kyme
One of the many ex-Games Workshop staff members who now works for Black Library. It would of course be completely unfair to point that Black Library does seem to hire a lot of people they already know.
Has written a lot of decent stuff for BL, including a series on the Salamanders and a tie-in novel for the Assault of Black Reach box set. The Black Reach novel tie-in is actually a bit of an outlier. He has written enough Salamanders and Salamanders-related material that either his overlords in GW has assigned him to make sure that particular corner of the fluff is as expanded upon as much as possible, or that his prize possession is a Vulkan dakimakura. Beside that, he is considered to be better than average by the consensus.
Though he does do some writing, it appears his main function at Black Library is as an editor, and has worked on many anthologies through the years. As such, he is thought to be the subject of much rage and hatred from an extremist fringe group of Warhammer literature enthusiasts who blame him for Black Library's spotty editing and that he is somehow responsible for not accepting their fanfiction for publishing. Fact of the matter is that he very likely has very little control over the former (outside of his own anthologies, of course), and probably no control over the latter (and Black Library very likely won't accept their submissions whatsoever).
He is not Ben Counter.