Ōyama Enrico Isamu Letter was born in Tokyo, in 1983 to a German-Italian father and a Japanese mother. Ōyama got interested in graffiti culture when he lived in Italy in 2000-2001, and initiated his own self-taught creation. After being back to Tokyo, he started to focus on drawing black-and-white, minimal yet spontaneous motif that was developed from visual language of graffiti culture, and established it as his signature style in Tokyo underground art scene around mid-2000's. He named the style "Quick Turn Structure", and has positioned his practice in the midst of contemporary art and street art, expanding his activity to writing of critical texts, participating symposia as well as commission works. In 2012 he moved to New York where he currently lives and works.