The last known lineup consisted of lead guitarist Danny Marino, bassist Chris Kells, drummer Simon Mckay, rhythm guitarist Pascal "Paco" Jobin and lead vocalist Vicky Psarakis, who joined in March 2014 following the departure of vocalist and founding member Alissa White-Gluz.

[2] They had shared the stage with bands such as Arsonists Get All the Girls,[3] Epica,[4] the Faceless,[5] Chelsea Grin,[6] Kamelot,[7] and Visions of Atlantis.

Originally intended as a demo, the release prompted the Agonist to add metal drummer Simon McKay to the band.

Released August 28, 2007, the video for "Business Suits and Combat Boots" was filmed by acclaimed director David Brodsky (Strapping Young Lad, Gwar, God Forbid).

After releasing the album, the Agonist toured with God Forbid, Arsis, Sonata Arctica,[11] Overkill, Visions of Atlantis, and Enslaved.

[15] The mini-video for "...And Their Eulogies Sang Me To Sleep" off the album Lullabies for the Dormant Mind, also filmed by David Brodsky, was released April 18, 2009.

[17] Vocalist Alissa White-Gluz appeared in March on Blackguard's album Profugus Mortis on the song "The Sword"[citation needed].

[23][17] She told Lithium Magazine that the record could be good for someone with an open mind musical taste, or bad for someone who only likes Thank You, Pain.

The video of "Panophobia" was released October 24, 2012, and featured live and behind-the-scenes footage of the band playing Montreal's Heavy Montréal Festival.

[25][26][27] In March 2014, White-Gluz announced that she had been chosen as the replacement for Angela Gossow as frontwoman of the Swedish melodic death metal band Arch Enemy.

[32] The Agonist was also booked to tour the western US in support of Fleshgod Apocalypse, but those dates were cancelled due to Covid restrictions.

[9] The Agonist are known primarily for both White-Gluz and Psarakis' integration of both death growls and clean vocals, and Marino's use of two or more intersecting melodies and unorthodox chords which often feature wide intervals and octave displacements.