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Aaron Gillespie (born July 18, 1983) is the drummer/vocalist for the Metalcore band Underoath (Tooth and Nail Records) and guitarist/vocalist for his project The Almost (Virgin Records/Tooth And Nail Records). He is also the co-owner of Pig Cloth, a new clothing line by him and his wife.

Underoath's Define the Great Line was certified Gold by the RIAA on November 11, 2006, representing 500,000 shipped units of the album. It is the second album in Tooth & Nail history to reach that distinction.

The Almost's debut album hit the U.S. Billboard charts at 39 with 29,000 copies sold. As of July 11, 2007, the album has sold 123,972 copies in the US.

Gillespie is heavily tattooed and is said to be a huge fan of the artist Kurt Halsey.