- Current
- Brandan Schieppati – lead vocals (since 1999)
- Brian Leppke – guitars (since 2001)
- Derek Youngsma – drums (since 2001)
- Ryan Wombacher – bass, backing vocals (since 2002)
- Marta Peterson – keyboards (since 2003)
- Dave Nassie – guitars (since 2009)
- Former
- Marc Jackson – bass (1999–2000)
- Troy Born – drums, percussion (1999–2001)
- Chad Tafolla – guitars (1999–2001)
- Vijay Kumar – bass (2000–2001)
- Molly Street – keyboards (2000–2003)
- Scott Danough – guitars (1999–2007)
- Jona Weinhofen – guitars (2007–2009)
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- Touring substitutions
- Mick Morris (Eighteen Visions) – bass (2001–2002)
- Patrick Judge (Demon Hunter) - guitars (Fill in for Brian Leppke in 2009)
- Mick Kenney (Anaal Nathrakh) - guitars (Fill in for Brian Leppke in 2010)
- Mark Garza (The Famine) - drums (2010)
- Guests
- John Pettibone (Himsa) (feat. on "Rise" on album Portrait of the Goddess)
- M. Shadows and Synyster Gates (Avenged Sevenfold) (feat. on "Savior, Saint, Salvation" on album Portrait of the Goddess)
- Ryan Downey (Die Die My Darling, ex-Burn It Down) (feat. on "City of the Condemned" on album This Is Love, This Is Murderous)
- Nick 13 (Tiger Army) (feat. on "Dearly Demented" on album The Truth feat.on "Just Another Pretty Face" on album)
- Ben Falgoust (Soilent Green) (feat. on "For Love and Failing" on album The Truth)
- Tim Lambesis (As I Lay Dying) (feat. on "Declaration" on the album Declaration)
- Dave Nassie (No Use For A Name) (feat. in guitar solo on "Beneath The Grey" on the album "Declaration")
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