Richard Christy was in Death, Control Denied and Iced Earth.
Sean Reinert was in Death's album Human and Cynic. Think he teaches Jazz drumming at Florida university or something but he is awesome at brutal metal with a jazzy touch as well.
Gene Hoglan was in Dark Angel, Death, Strapping Young Lad.

Get these albums-

Death: Human, The Sound of Perservernce, Symbolic, Individual Thought Patterns

Cynic: Focus

Dimmu Borgir: Puritanical Euphoric Misanthropia