Prior, he released his debut album Collection One (2018), its follow up, Ghetto Lenny's Love Songs (2019) through the L.A. Reid's label Hitco.

[8][13] In the following years, Saint Jhn wrote songs for Kiesza, Gorgon City, and Nico & Vinz, among others.

[14] In 2016, he earned a writer credit for the Usher songs, "Crash" and "Rivals", both of which appeared on the album Hard II Love.

[18] In February 2017, Jidenna's album, The Chief, was released featuring the song, "Helicopters / Beware", which Saint Jhn co-wrote.

In addition to working on music and a tour in support of Collection One, Saint Jhn was hired by Gucci as a model for its "Guilty" campaign alongside Adesuwa Aighewi.

[27] In early October 2020, Saint Jhn was among the acts who performed live for the 2020 Billboard Music Awards, following the success of "Roses".

[27] In December 2022, Saint Jhn and London on Da Track released "Stadiums" as the first single for their upcoming collaborative album.