After attending MFA at Tokyo University of the Arts in 2007-09, he named the motif Quick Turn Structure, and has positioned his practice in the midst of contemporary art and street culture. Oyama stayed in New York for 6 months in 2011-2012 as a grantee of Asian Cultural Council. Since then, he lives and works in Brooklyn and Tokyo. Oyama held solo exhibitions internationally at institutions including Daiwa Anglo-Japanese Foundation (London), Marianna Kistler Beach Museum of Art (Kansas), Pola Museum of Art (Hakone), Nakamura Keith Haring Collection (Yamanashi), Tower 49 Gallery (New York) and Kanagawa Prefectural Gallery (Yokohama).

His first book Against Literacy: On Graffiti Culture was published by LIXIL Publishing in 2015. In 2020, he has authored 3 books; The Real Faces of Street Art: New York Writing Culture (Seido-Sha Publishing), The Art of Streets: From Twombly to Banksy (Kodansha Sensho Metier), The Semantics of Aerosol: The thoughts and Arts of Post-Pandemic – A Dialogue with Tetsuo Kogawa (Seido-Sha Publishing).

Oyama edited the special issue on aerosol writing for renowned Japanese art magazine Bijutsu Techo, and undertook collaboration with brands such as Comme des Garçons , Shu Uemura and Audi. Since 2020, Oyama works in 2 studios in New York and Tokyo back and forth.