Favourite mastering engineers / houses?

[Glenn Fricker]

Fredman guys are awesome,
Phil DeMetro at Lacquer Channel in Toronto is great to work with & a total old-school headbanger.

Maor Appelbaum might just be the nicest guy I've ever dealt with in the big leagues, & he does stellar work as well.

 

[Soundlurker]

I can recommend Nathan James @ The Vault Mastering