*[[Maynard James Keenan]] ([[Tool]] / [[A Perfect Circle]] / [[Puscifer]])
*[[Danny Lohner]] ([[Nine Inch Nails]] / [[A Perfect Circle]] / Black Light Burns)
*[[Alan Moulder]] (producer, [[producer, Nine Inch Nails]] / Smashing Pumpkins)
*[[Trent Reznor]] (Nine Inch Nails)
*[[Atticus Ross]] ([[12 Rounds]] / [[Error]])