In an interview with Roadrunner Records, he named Kirk Hammett, "Dimebag" Darrell Abbott, Dave Mustaine, Marty Friedman and Kerry King as being influential to his playing style.

He also has an instructional DVD available through The Rock House Method which focuses on metal guitar, soloing, riffing, and song writing.

Arnold, Talley, and Six Feet Under vocalist, Chris Barnes, wrote and recorded 2011's Undead, then briefly toured Europe and the United States.

On May 22, 2012, Six Feet Under announced that guitarist Ola Englund would be replacing Arnold, who planned to retire from touring.

The band suggested that Arnold may perhaps remain a central writing partner and collaborator on future Six Feet Under releases.