[9] He played in the rock band Relative Degree with drummer Rob Bourdon, but the group disbanded after their first live show.

[13] Delson, alongside Mike Shinoda and Rob Bourdon, founded Xero, the earliest incarnation of Linkin Park, in 1996.

[14] After Wakefield left Xero, Delson turned to his former boss Jeff Blue from Zomba Music to help find a replacement.

[15] After the release of Hybrid Theory, Delson was closely involved with the production and creative direction of Linkin Park's sound alongside Shinoda.

[22] Delson explained his rationale behind founding his own record label, commenting, "Too many people in the music industry tried to preserve the status quo instead of embracing innovation.

"[22] Delson has stated that he "doesn't like to show off", and that he attempts to play his guitar so that it sounds as though it were the keyboard or strings so as to seamlessly fit in with the band's hip-hop- and electronica-style compositions.

Although a self-described "fervent opponent of guitar leads," he started performing solos in the Minutes to Midnight era after his bandmates encouraged him to do so.

For the first two albums, he used Mesa/Boogie Dual Rectifiers and modified Marshall 1959SLP reissue heads live and in the studio, but during the recording of Minutes to Midnight Delson decided not to use much of his old equipment to give him a new sound.

[35] In 2014, the Randall rig was eventually phased out for a Fractal Axe-FX II setup, which is run direct into the PA system and a Matrix GT1000FX power amp.

[37] He was the keynote speaker at his alma mater UCLA's College of Letters and Science commencement ceremony on June 12, 2009, in Pauley Pavilion.