[2] Before joining Memphis May Fire through an open audition in 2008 Mullins played in several local music groups in Spokane.

[6] He worked on the Between the Lies EP and the albums Sleepwalking, The Hollow, Challenger, Unconditional, This Light I Hold, Broken, Remade in Misery and Shapeshifter.

He is featured as guest vocalist for several acts like Woe, Is Me, Hands Like Houses, Sleeping with Sirens, For Today, Spoken, Nowhere To Be Found and Yellowcard.

"Walk Alone" was released on June 21st 2024 with an accompanying music video, with Mullins appearing to take over fully the mantle of the band's lead vocalist.

Mullins wrote "Prove Me Right" about the band's former label, Trustkill Records, and is a critique on the younger music industry.