Oscar was born and raised in Örnsköldsvik, Sweden, until he decided to break free from his heritage of optometry and moved to New York, to attend The Lee Strasberg Theater and Film Institutes 2 year certificate program. Youngest of three siblings and the only son of Birgitta and Claes Reis both opticians. He's first appearance came in the short drama Jukebox Rebel Baby(2015), a film by Tyler Onassis.