Sonny John Moore (born January 15, 1988), professionally known as Skrillex, is an American electronic musician from Los Angeles, California, well known for his role as the former frontman for the post-hardcore band From First to Last.

On February 27, 2007, Moore announced he had left From First to Last to pursue a solo career. After months of releasing demos via Myspace, Moore played on the Team Sleep Tour with a full band. Moore made several demo albums available on this tour, limited to about 30 per show. These albums were tour exclusive, and were packaged in "baby blue envelopes", each with a unique drawing by Moore or bandmate.

In 2008, Moore began DJing under the alias Skrillex at clubs in the Los Angeles area. On June 7, 2010, Moore released his official Skrillex debut EP, “My Name is Skrillex.”

On April 7, 2009, he released “Gypsyhook” EP, a digital EP, which featured three songs and four remixes. Also included was a Japanese version of "Mora" entitled "Kai Sui". Physical copies of the EP were available at his shows.

In the summer of 2010, Moore provided programming and vocals for English metalcore band Bring Me the Horizon on their third studio album “There Is a Hell, Believe Me I've Seen It. There Is a Heaven, Let's Keep It a Secret.” Later in the year, Sonny released his second EP, “Scary Monsters and Nice Sprites.”

A third EP and first remix collection, "More Monsters and Sprites" consisting of three new tracks and four additional remixes of the title track from his previous EP, was released in 2011.