Dan more of a producer? haha well... he does that a lot, but he's first and foremost a musician i would have to say... and he does most styles you can think of, well covers the emotional spectrum anyway hehe and that's more important than stylistic diversity i think...
anyway yeah, some bands he was/is in:
Edge Of Sanity
Nightningale
Unicorn
Pan-Thy-Monium
S/T project
that's most of the main ones. There's about a million others though hehe