Quinn was the vocalist of the band Closer 2 Closer with guitarist and songwriter Titus Lockard from 2005 to 2008, and also auditioned to become the vocalist for
Dance Gavin Dance before joining Sleeping with Sirens in 2009. He is also the former vocalist of the Michigan band For All We Know. The band released their first album in 2010,
With Ears to See and Eyes to Hear through
Rise Records, which sold 25,000 copies, and reached number seven on the
Billboard charts. Sleeping with Sirens released a single in celebration of
Halloween, "Dead Walker Texas Ranger" on October 22, 2012. Quinn participated in the music video for "
King for a Day" by the band
Pierce the Veil, released in 2012. The single went gold in 2014 and platinum in January 2020. Quinn also collaborated with New Zealand band
Written By Wolves on their Collab Project in 2021, sharing lead vocals on the song "Help Me Through the Night". In 2020, Quinn started a solo side project with producer
Cameron Mizell called "Downer Inc" and released a six-track EP called "Whatever This Is". Quinn appeared on the
Sonic Frontiers soundtrack in 2022, acting as lead vocalist for four of the songs on the games soundtrack. Quinn also appeared as a special guest at the September 30, 2023
Sonic Symphony where he performed some of the songs from the soundtrack including "Undefeatable" and "Break Through it All". Quinn owns his own clothing line, "Anthem Made", and is the founder of "Dreamer Development Group", a support network for aspiring artists like Manic, and Roseburg. Kellin Quinn collaborated with The Frst on the track “Bruce Lee,” released on June 28, 2023, and “Love In 3D,” which was released on November 1, 2024. On January 16, 2025, Quinn announced his
solo project, Haunted Mouths, and released the single "Further Til We Disappear". His debut
studio album under Haunted Mouths,
A Collection of Greetings, was released on February 14, 2025. Quinn described the record as a "love letter to [his wife]". == Personal life ==