premise: Brad Wilk was a member of Greta in January of 1990.
hypothesis: Brad Wilk . He is best known as the drummer of the rock bands Rage Against the Machine ( 1991 -- 2000 ; 2007 -- 11 ) and Audioslave ( 2001 -- 07 ) . Wilk started his career as a drummer for Greta in 1990 , and helped co-found Rage with Tom Morello and Zack de la Rocha in August 1991 . Greta was an American hard rock band formed in 1990 by Paul Plagens , Kyle Baer , Josh Gordon , and Brad Wilk .