Daniel Virgil Maisonneuve (Sub Urban) was born on October 22, 1999, in Nyack, New York to a French Canadian father and a Taiwanese mother. While raised in the suburbs of Ridgewood, New Jersey, he began producing music at the age of 15. He was trained in classical piano at the age of 6, but quit after claiming that he was "sick of playing other people's compositions". In the fall of 2016, Maisonneuve dropped out of high school to pursue his musical career, "isolating" himself to work on various demos and songs.