Tranter has written songs for artists such as Britney Spears, Gwen Stefani, Linkin Park, Kelly Clarkson, Sara Bareilles, Selena Gomez, Justin Bieber, DNCE, Citizen Queen, Kesha, Imagine Dragons, The Knocks, Fifth Harmony, 5 Seconds of Summer, Chappell Roan, Halsey, Ariana Grande, Lady Gaga, Raye, Bea Miller, Demi Lovato, Dua Lipa, Måneskin, and Fall Out Boy.

[2] Tranter says that they experienced bullying during their youth,[3] which caused them to be transferred from the Lake Zurich public high school to the Chicago Academy for the Arts after a semester.

[9] While still part of Semi Precious Weapons, Tranter moved to Los Angeles and signed a publishing deal with Warner Chappell Music in 2012 to write songs for other artists.

[7] After signing with Warner Chappell, Tranter began working with artists such as Justin Bieber, Selena Gomez, Hailee Steinfeld, Fifth Harmony, and Fall Out Boy.

[21] Tranter's activism began in high school at the Chicago Academy for the Arts, where they created the annual AIDS Benefit to raise awareness for HIV/AIDS.

[4][5] This was followed by Musicians with a Mission, a scholarship fund for LGBT youth education that Tranter founded while attending the Berklee College of Music.

[25] Each year, Tranter hosts an in-person Spirit Day concert to raise funds for GLAAD's efforts to support LGBT youth.

[29] Tranter's jewelry company, Fetty, grew out of necklaces they designed to sell as merchandise for the Semi Precious Weapons shows.

[34] In December of the same year, they served as a coach on the MTV reality show Made, in which they helped a young girl transform into a "rock star".

[35] In 2010, Tranter and their fellow Semi Precious Weapons members had cameo appearances in Lady Gaga's music video for "Telephone".