John Thomas Mateer (born December 4, 1995), is an American musician, filmmaker, and entertainment entrepreneur. He grew up in Wantagh, New York. Mateer was an early-era content creator on YouTube in the late 2000s, and his first media appearances resulted from the viral content that he created on the platform. Shifting his focus towards music at the beginning of the 2010s, Mateer released his first extended play, Love is Not a Lifestyle, in the summer of 2011. Mateer has confessed to regretting making the EP altogether, causing him to take a decade-long hiatus from making music. Mateer’s entrepreneurial endeavors most notably include the founding and operation of the post-production company, RIOT MOTION LLC. The company operates out of the East Village in New York City. He also started the nonprofit organization, Empathy Always Corp., which provides relief to victims of narcissistic abuse. Mateer writes both screenplays and poetry professionally as well. His first published collection of poetry, The Flight of a Monarch: Poetry From Young Adulthood, releases in spring 2023.