Kellin Quinn Bostwick (born April 24, 1986) is an American singer and musician. He is the lead vocalist and keyboardist of the post-hardcore band Sleeping with Sirens. He is known for his distinctive vocals and for collaborating with other artists, as well as the SEGA Sound Team on the game Sonic Frontiers (2022). Some of his best known collaborations are on the tracks "King for a Day" with Pierce the Veil, and "Love Race" with Machine Gun Kelly. In 2025, Quinn released A Collection of Greetings, his debut studio album under the solo projectHaunted Mouths.
Quinn is the vocalist of the band Sleeping with Sirens with guitarist and songwriter Titus Lockard,[2] and also auditioned to become the vocalist for Dance Gavin Dance[3] before joining Sleeping with Sirens in 2009. He is also the former vocalist of the Michigan band For All We Know.
Sleeping with Sirens released a single in celebration of Halloween, "Dead Walker Texas Ranger" on October 22, 2012.[6] 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.[7] 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".[8][9]
Quinn appeared on the Sonic Frontiers soundtrack in 2022, acting as lead vocalist for four of the songs on the games soundtrack.[10] 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".[11][12][13]
Quinn owns his own clothing line, "Anthem Made",[14] and is the founder of "Dreamer Development Group",[15] a support network for aspiring artists like Manic,[16] 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.[17][18]
On January 16, 2025, Quinn announced his solo project, Haunted Mouths, and released the single "Further Til We Disappear".[19] His debut studio album under Haunted Mouths, A Collection of Greetings, was released on February 14, 2025.[20][21] Quinn described the record as a "love letter to [his wife]".[19]
Personal life
Quinn married in 2013.[22] The couple have a daughter named Copeland, born in 2012. He also has two stepsons from his wife's previous marriage.[23][24]
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