[1][2] The group consists of vocalist Sean McCulloch, guitarist Daniel Gailey, bassist Bryce Kelley and drummer Isaiah Perez.

The band recorded and released a demo in 2005 with the line-up of Matt Yriarte (lead vocals), Glenn Gizzi (lead guitar, backing vocals), Michael Ruffino (rhythm guitar), Phil Killpatrick (bass), and Michael Killpatrick (drums).

The band went through a few line-up changes following the demo's release before settling on Sean McCulloch (vocals), Scott Whelan (rhythm guitar), Ryan Estrada (bass) and Lee Humerian (drums) in addition to Gizzi.

[8] After finishing production of the album, the band looked at many labels, before being signed to Red Cord Records in 2011.

[20] At the end of 2014, Phinehas announced they would begin working on their third studio album after concluding their tour for The Last Word Is Yours to Speak.

[23] On July 13, three days after the album's release, the band unveiled a music video for the third single, "White Livered".

[24] On December 16, 2016, the band released their third EP, titled Fight Through the Night featuring guest vocals from Garrett Russell of Silent Planet.

[3][29] On September 22, the band announced their fourth studio album titled Dark Flag would be released on November 17, 2017.

On April 18, 2018, Phinehas announced that the session drummer of their past tour, Isaiah Perez, would be taking over the formerly vacant drums permanently.

[33][34] On March 27, 2021, the band posted a photo on its official Facebook page, announcing that production of the album had begun.