A four-time Grammy Award nominee, and he has been credited on commercially successful releases for artists such as Michael Jackson, Whitney Houston, Kelly Clarkson, Britney Spears, Ariana Grande, Bruno Mars, Christina Aguilera, Adam Lambert, Jennifer Lopez, Kesha, Brandy, Keke Wyatt, Tori Kelly, and One Direction.

He is one-half of the duo Louis York, which he formed with Chuck Harmony in 2015; the two also co-founded the record label Weirdo Workshop that same year.

[7] Nicknamed the Studio Beast,[6] Kelly has written numerous hits, including the Britney Spears song "Circus", which he wrote with Dr. Luke and Benny Blanco and reached No.

[11] Kelly co-wrote and recorded backing vocals for "International Love" by Pitbull featuring Chris Brown, which peaked at number 13 on the Billboard Hot 100.

[1] Kelly has written songs for Whitney Houston,[13] R. Kelly,[14] Miley Cyrus,[3] Olly Murs,[6] Jessie J,[1] Britney Spears,[15] Leona Lewis,[3] John Legend,[4] Faith Evans,[4] Joe Jonas,[16] Jason Derulo,[5] Backstreet Boys,[6] Adam Lambert,[6] Martina McBride,[3] Christina Aguilera,[2] One Direction,[2] The Wanted,[3] and the K-pop girl group Wonder Girls.

[4][18] In August 2013, it was announced that he and Jenna Hally Rubenstein were partnering to executive produce and develop a reality television show to find undiscovered music moguls.