I think it is safe to say that Blizzard employees read AJ so, thank you Blizzard for employing/promoting someone who actually does his job right. Hopefully GC won't have be involved in decision soon so Holinka can improve PvP even more.
There are still many who don't know his twitter or don't even have an account to tweet at him, I encourage you to do so since he actually replies to most tweets and unlike GC he actually says things that make sense.
I found more information regarding Holinka! You can find out more about him on his LinkedIn profile here:
Prior to working for Blizzard he seems to have been working on a game called Transformer: Fall of Cybertron. I've never heard about that game personally. The company only had 200 employees it seems.
And before that he was a Senior Game Designer at THQ. Pretty interesting!