Mullen joined the Seattle punk rock band, Sledgeback in the year 2009.

[2] Tim Mullen was a member of Seattle heavy metal outfit, Himsa.

He accomplished several US and European tours as member of the band, supporting acts like Lamb of God, Avenged Sevenfold, AFI and Hatebreed.

Tim Mullen departed Himsa in 2004 and has not played in a notable project until February 2009, when he joined Sledgeback.

Tim Mullen uses Gretsch Drums, Zildjian Cymbals, Tama Hardware, Remo Heads, and Promark Sticks.