I just now followed a rabbit-trail to the Savatage Wikipedia page, which says that Zak is more-or-less back with Savatage since 2014. Will they please record an another album, already?!!?
The Savatage albums he's on all are a funny mixed bag for me. About half of the songs are skippable filler (as far as I'm concerned) but then there's a few spectacular pieces that more than make up for them and make buying the album worthwhile.
If they churned out a consistently awesome album it would be among my all-time favorites.