JGRXXN is an LA-based underground rapper and producer mostly known for founding the SCHEMAPOSSE collective in 2015.

Before creating SCHEMAPOSSE, JGRXXN was a member of the hip-hop collective created by SpaceGhostPurrp, RVIDXR KLVN. He made many feats within the collective with underground artists such as Denzel Curry, Pouya, Juicy J, and Xavier Wulf.

After the RVIDXR KLVN broke up, and after creating the SCHEMA collective, JGRXXN started to have certain notoriety and began a series of shows and tours with the $UICIDEBOY$ and their GRAYSCALE TOUR with Black Smurf, Ramirez and Chetta.

In June 2016, after many members of the collective left, including Lil Peep and Ghostemane, JGRXXN decided to end SCHEMAPOSSE.

In 2018 SCHEMAPOSSE regrouped and released THE GOLD EP, and in 2020 they regrouped again to release THE NEW AGE and HALLOWS EVE. In 2021 they released PHANTOM HEARTS. All 3 new projects featured old and new members (notably SXMPRA, DjvSiREN, Akatami and more). After 2 years of no activity, SCHEMAPOSSE unofficially disbanded again in 2022 majority of its members decided to go their separate ways.