On February 5, 2009, at age 17, Richardson replaced Chris Storey of
All Shall Perish as a touring member. In late 2011, Richardson parted ways with Born of Osiris. Then, in early 2012, he joined
Chelsea Grin. On September 12, 2015, Richardson announced his departure from the band to focus on a solo career. In 2016, Richardson released his debut solo album entitled
I, produced by
Taylor Larson and with ex-
The Word Alive drummer
Luke Holland as a member. The album had many guest appearances from the likes of
Periphery's Mark Holcomb & Spencer Sotelo, Lukas Magyar of
Veil of Maya, and
Jeff Loomis. On November 9, 2018, it was reported that Richardson would replace the deceased
Oli Herbert as live member for
All That Remains on their European tour with Sevendust in December. On February 5, 2019, he became a full-time member of the group, appearing on their 2025 album
Antifragile. Richardson left the band on July 29, 2025. Between 2018 and 2022, Jason released four singles; "Tendinitis", "Upside Down (Featuring Tim Henson of Polyphia)", "Ishimura" and "p00mbachu" from his sophomore album titled
II, which was released on July 15, 2022.
II features Luke Holland on drums. He was featured on
Falling in Reverse's song
Ronald. == Discography ==