In 2014, after Logan Mader had spent more than a decade away from the stage, Monte Conner of Nuclear Blast sent Australian musician Lauren Hart to him for a production deal. Once they met, Hart switched from guitars to vocals. Damien Rainaud then joined on bass with Ralph Alexander stepping in on drums. Logan chose not to recruit well known musicians, as he wanted his band to be neither a supergroup nor a side project for each of its members. On May 26, 2015, the band released a lyric video for title track "The Life I Remember". A similar video for "Terminal" was released on July 10, 2015. Just under one month later on August 7, 2015, the band published "You Cunt", their first music video showing the band performing their song alongside a theatrical plot. It was around this time that Ralph Alexander and the ensemble parted ways, with Dillon Trollope and Skyler Howren joining the band on drums and guitar, respectively. From late August 2015 until the end of September 2015, the band toured the southern, midwestern and southwestern United States with Fear Factory, The Bloodline and Before the Mourning. Near the beginning of the tour, their debut studio albumThe Life I Remember was released via earMusic. In November and December 2015, the group toured Europe with American industrial metal band Fear Factory.
In 2016, the ensemble stated via their Facebook page that they have started a second studio album. In August 2016, the band stated that they planned during the next month, to release a music video for a new song titled "Eye of Chaos". On September 13, 2016, Evolution, the title of the album, was announced along with a music video for "Eye of Chaos". The full length album is set to release on February 17, 2017. In late September 2016, the band announced that Max Karon from heavy metal ensemble I of Tongues has joined them on guitar. In December 2017, the band indicated that they were working on a new album. In late February to mid March 2018 the band were set to tour Australia with supports from In Death..., Rise of Avernus and Hollow World which ended up being cancelled due to the sacking of manager of Sydney venue The Bald Faced Stag who founded the touring company Stag Music Touring for allegedly not paying bands who performed at the venue for over several months. This put the touring company in jeopardy and they worked hard to find a replacement but there was not enough time to do so which led to its cancellation. In May 2019, the ensemble stated via their Facebook page that they are currently working on their third studio album.
Critical reception
stated that "the musical chemistry between Mader and Hart was so palpable that it pulled him out of band retirement" and that "musically, Once Human are as visceral as they are vicious". The site goes on to say that "Hart is a vocal demoness, unleashing the beast that resides deep within her" and that "she is in possession of a fierceness that will leave you shaking in your boots". Blabbermouth.net describes Hart's singing as a "throat-scarring level of vocal brutality that completely contradicts her soft appearance". Jeremy Borjon of Revolver magazine stated that the band portrays "an impeccably produced, ruthless and mature sound in the vein of Arch Enemy and DevilDriver" with Hart bringing "the metal with clear and compelling screaming fleshed out by a groovy and thunderous rhythm section".
