Simon Alexander Neil is a Scottish singer, guitarist and songwriter. He is known for his work in the bands Biffy Clyro, Marmaduke Duke, and also Empire State Bastard, with Mike Vennart.

David Lombardo is a Cuban-American drummer, best known as a co-founding member of the thrash metal band Slayer. He currently plays drums with Fantômas, Dead Cross, Mr. Bungle, Empire State Bastard, and Misfits.