Ghost Mountain, born Wren Kosinski in Sacramento, California, is a founding member of the rap collective Haunted Mound, alongside Sematary. He grew up immersed in music, with RL Grime being an early influence. His first known music venture was as the group, Wrendered along side Sematary where they made a handful of mixes during 2016 and 2017.

In 2019, Sematary started the group Haunted Mound with Ghost Mountain, inspired by old trap artists such as Chief Keef and Swedish black metal bands like Lifelover, aswell as Witchhouse band SALEM

In April of 2021, Ghost Mountain deactivated all of his social media accounts and officially left Haunted Mound and music as a whole to focus on college. His reasoning for leaving was never official but it’s believed it was due to Sematary’s misogynistic and violent lyrics against women, as well as Sematary’s ego getting in the way of their friendship.

As of September 22nd, 2024, Ghost Mountain has reactivated Instagram, made a post and been reposted by all of the Haunted Mound members, confirming that he has returned to music and the group.